Colorado General Knowledge Practice Test

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This is our Colorado General Knowledge Practice Quiz and Practice Test compiled of 50 questions each. Each question is worth two points for a total of 100 possible points. A passing score is 80%.

The General Knowledge Practice Quiz reveals the correct answer during each question to help you study for the actual General Knowledge test. The General Knowledge Practice Test doesn’t reveal the correct answers until the test is over.

The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window. It’s that easy.

Press the start button to begin your free General Knowledge Practice Quiz. Good luck!

General Knowledge CDL Practice Quiz

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Congratulations! You have completed the General Knowledge CDL Practice Quiz. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

When loading cargo, what is an important rule to remember?

A	Load cargo toward the rear of the truck for easier unloading.
B	Load cargo weight evenly over all the axles.
C	Load more weight over the drive axle for better traction.
D	Load more cargo toward the front of the truck for a full load.

Question 2

Which of the following fires can be safely extinguished by water?

A	Electrical fire.
B	Gasoline fire.
C	None of these fires can be safely extinguished by water.
D	Grease fire.

Question 3

Which of the following methods should you use to test hydraulic brakes for leaks?

A	Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move.
B	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.
C	Push the brake pedal firmly 5 seconds; listen for leaks.
D	Move forward slowly and push firmly on the brake pedal.

Question 4

Two main things to look for up ahead while driving are ______ and ______.

A	vehicles, traffic signs
B	law enforcement officers, detours
C	tunnels, overpasses
D	truck stops, gas stations

Question 5

You are operating a new truck with a manual transmission and are about to drive down a long, steep downhill grade? What should you do?

A	Shift the truck into neutral and coast down the hill to save gas.
B	Use the same gear you would use to climb the hill.
C	Use a higher gear than you would use to climb the hill.
D	Use a lower gear than you would use to climb the hill.

Question 6

The reason placards are used is:

A	to avoid mixing hazmat with food.
B	to combat terrorism.
C	to warn others of hazardous materials.
D	to make your vehicle look official.

Question 7

When a coolant container is part of a pressurized system, you can:

A	safely remove the radiator cap and add coolant while the engine is hot.
B	check the coolant level of a hot engine.
C	use windshield washer fluid as coolant.
D	use only water in the cooling system.

Question 8

A pre-trip inspection should be completed:

A	whenever you stop to refuel.
B	at least once a week.
C	before operating the vehicle.
D	if any problems occurred the last the time the vehicle was operated.

Question 9

One reason why dry bulk tanks require special care is because:

A	a dry bulk tank should only be filled halfway.
B	the load can shift.
C	the load should not get wet.
D	the load can catch fire easily.

Question 10

The amount of liquid to load into a tank depends on:

A	both of these.
B	the legal weight limits.
C	neither of these.
D	the weight of the liquid.

Question 11

The correct term for a long commercial vehicle's tendency to swing wide on turns is:

A	slidetracking.
B	sidetracking.
C	offtracking.
D	fishtailing.

Question 12

A trailer is more likely to swing around when the trailer wheels lock up when:

A	the trailer is empty or lightly loaded.
B	the trailer is being hauled at high speed.
C	the trailer is fully loaded or very heavy.
D	the trailer is out of brake adjustment.

Question 13

Any flatbed load must have at least ______ tie downs.

A	two
B	one
C	four
D	three

Question 14

When driving a slow-moving vehicle on a 2-lane highway, you must pull off at the first safe turnout when the number of vehicles behind you is:

A	seven or more.
B	none of these.
C	five or more.
D	three or more.

Question 15

What happens as a person's Blood Alcohol Concentration (BAC) goes up?

A	Muscle control and coordination are affected.
B	All of these things happen.
C	Judgment and self-control are the first to be affected.
D	The drinker's brain is increasingly affected.

Question 16

You know your brakes are fading when:

A	there is a slight vibration when you press down on the brake pedal.
B	you have to push harder and harder to get the same stopping power on a downgrade.
C	you release pressure on the brake pedal and speed increases.
D	the brake pedal feels firm when you apply pressure.

Question 17

If you become sleepy while driving, you should:

A	slap yourself in the face three times.
B	turn up the radio.
C	stop to sleep.
D	roll down the windows.

Question 18

Empty trucks ______.

A	have better traction when stopping than full trucks
B	need less space ahead than full trucks
C	have the same stopping distance as full trucks
D	require greater stopping distance than full trucks

Question 19

What three things add up to the total stopping distance for your vehicle?

A	Perception distance, reaction distance, and braking distance.
B	Perception distance, response distance, and reaction distance.
C	Perception distance, slowing distance, and braking distance.
D	Observation distance, reaction distance, and slowing distance.

Question 20

Your ______ are the most important way to see the sides and rear of your vehicle.

A	rear view cameras
B	sunglasses
C	mirrors
D	rolled down windows

Question 21

With regard to safe driving, what does communicating mean?

A	Using your CB radio or cell phone to inform others.
B	Using hand signals.
C	Using a helper when backing up.
D	Using turn signals, 4-way flashers, headlights, and the horn.

Question 22

Two things a driver can do to prevent a rollover are, to go slow around turns, and also:

A	keep the cargo as close to the ground as possible.
B	downshift into the turn.
C	check to make sure that the brakes are properly balanced.
D	keep two hands firmly planted on the steering wheel at all times.

Question 23

Wheel bearing seals should be checked for ______.

A	rubbing
B	rust
C	leaks
D	burning

Question 24

How many red reflective triangles should be in your vehicle's emergency equipment?

A	A minimum of three.
B	A minimum of one.
C	A minimum of two.
D	A minimum of four.

Question 25

When driving on a slippery road during the day, how much space should you keep ahead of your truck?

A	One vehicle length for every 10,000 lb. of gross vehicle weight.
B	More space than is needed for ideal driving conditions.
C	The same amount of space you would at night.
D	The same amount of space you would on a dry road.

Question 26

Serious vehicle skids are usually caused by:

A	poorly adjusted brakes.
B	driving too slow for road conditions.
C	driving too fast for road conditions.
D	bad tires.

Question 27

You are exiting a highway using an offramp that curves downhill and you are driving a heavy vehicle. What should you do?

A	Turn on your four-way flashers as you approach the offramp.
B	Downshift after you are in the curve.
C	Slow to a safe speed before the curve.
D	Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp.

Question 28

The two driving conditions in which you should downshift are:

A	before starting down a hill and before going up a hill.
B	before starting down a hill and before entering a curve.
C	before starting down a hill and before entering a tunnel.
D	before going up a hill and before entering a curve.

Question 29

Why should know the outage needed for the liquids you carry?

A	Because tank baffles are not always legal with outage.
B	Because it's good to know that information.
C	Because some of the heaviest liquids don’t need any.
D	Because some liquids expand more than others when they get warm.

Question 30

Your stopping distance will increase by ______, if you double your speed.

A	two times
B	three times
C	four times
D	half

Question 31

Rust around a lug nut is a sign that:

A	the wheel needs cleaning.
B	the lug nut needs to be replaced.
C	the lug nut is loose.
D	the lug nut is cheap.

Question 32

When you are driving at night, you should:

A	make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency.
B	drink coffee or other caffeine products to help keep you awake.
C	keep your high beams on at all times.
D	roll down your window so that the fresh air will help keep you awake.

Question 33

You should make emergency plans when you see a hazard because:

A	you want to have a plan to communicate the risk.
B	you want to have time to act before it turns into an emergency.
C	you want to avoid doing something all of a sudden.
D	it is a federal law.

Question 34

The trailer hand valve (also called the trolley valve or Johnson bar) should only be used when:

A	you will be parked for a short time.
B	it is absolutely necessary.
C	there is ice and snow, to prevent skidding.
D	testing the trailer brakes after hooking up to a trailer.

Question 35

How much stopping distance does a light, empty truck require, compared to the same truck fully loaded and heavy?

A	Greater stopping distance.
B	It depends on what mood you are in at the time.
C	Shorter stopping distance.
D	The same amount of stopping distance.

Question 36

The braking power of the spring brakes:

A	decreases when the service breaks are hot.
B	depends on the service brakes being in adjustment.
C	increases when the service brakes are hot.
D	is not affected by the condition of the service brakes.

Question 37

While doing the pre-trip inspection on your vehicle's steering and exhaust system you found the following problems. Which one, if any, should be fixed before you drive the vehicle?

A	Play in the steering wheel of more than ten degrees (two inches on a 20-inch steering wheel).
B	Play in the steering wheel of more than five degrees.
C	Too many vertical stacks.
D	Oil on the tie rod.

Question 38

Whenever you are parked at the side of the road at night, you must do which of the following?

A	Keep your low beam lights on.
B	Warn other drivers by using your left turn signal lights.
C	Put your warning devices out within 15 minutes.
D	Turn on your 4-way emergency flashers to warn other drivers.

Question 39

The minimum tread depth that front tires should have for safety is:

A	3/32-inch in every major groove.
B	2/32-inch in every major groove.
C	5/32-inch in every major groove.
D	4/32-inch in every major groove.

Question 40

Before backing under, when coupling a semi-trailer to your tractor, the trailer is at the right height when:

A	it will be raised slightly when the tractor is backed under it.
B	the end of the kingpin is even with the top of the fifth wheel.
C	the kingpin is about 1¼ inches above the fifth wheel.
D	the end of the kingpin is at waist level.

Question 41

______ can cause a fire.

A	under inflated tires
B	loose fuel connections
C	both loose fuel connections and under inflated tires
D	eating spicy food in the truck cab

Question 42

Containerized loads are:

A	generally used when freight is carried part way by rail or ship.
B	exempt from hazardous materials restrictions.
C	exempt from weight limit restrictions.
D	exempt from height restrictions.

Question 43

Which of the following is considered a hazard?

A	All of these are considered a hazard.
B	A stopped transit bus.
C	Pedestrians and bicyclists.
D	Road construction zones.

Question 44

When backing your vehicle, why should you use a helper?

A	To direct traffic away from you.
B	To prevent others from distracting you.
C	To watch for steering errors.
D	To see the blind spots you can't see.

Question 45

When checking the adjustment on air brakes, slack adjusters should have ______ of travel.

A	one half inch
B	one inch
C	three inches
D	two inches

Question 46

Due to its size, if your vehicle cannot make a right turn without swinging into another lane, you should ______ to prevent others from passing you on the right.

A	turn right and drive over the curb
B	turn wide before you start the turn
C	turn wide as you complete the turn
D	start the turn, then back up to re-position

Question 47

Before transporting a sealed load, it is important to check that the:

A	placard numbers match the seal numbers.
B	seal is secure.
C	load is properly secured.
D	seal is authentic.

Question 48

The two main causes of tire fires are ______ and ______.

A	dual tires that touch, hot road surfaces
B	under-inflated tires, dual tires that touch
C	over-heated brakes, under-inflated tires
D	poor-quality retreads, under-inflated tires

Question 49

The most important reason for conducting a pre-trip inspection of your vehicle is:

A	because law enforcement may inspect your vehicle on the road.
B	because it is a requirement for all drivers.
C	to ensure safety for yourself, your passengers, and other drivers.
D	to help ensure the vehicle will make it to your destination.

Question 50

If your vehicle has a retarder, you should turn it off when:

A	the road is wet, icy, or snow covered.
B	you are driving on hilly, rural roads.
C	you are driving on the freeway.
D	road conditions are excellent.

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Remember, the General Knowledge Practice Test doesn’t reveal the correct answers until the test is over. The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window.

Press the start button to begin your free General Knowledge Practice Test. Good luck!

General Knowledge CDL Practice Test

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Congratulations! You have completed the General Knowledge CDL Practice Test. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

The two main causes of tire fires are ______ and ______.

A	poor-quality retreads, under-inflated tires
B	over-heated brakes, under-inflated tires
C	dual tires that touch, hot road surfaces
D	under-inflated tires, dual tires that touch

Question 2

The two driving conditions in which you should downshift are:

A	before starting down a hill and before entering a tunnel.
B	before starting down a hill and before going up a hill.
C	before starting down a hill and before entering a curve.
D	before going up a hill and before entering a curve.

Question 3

What happens as a person's Blood Alcohol Concentration (BAC) goes up?

A	All of these things happen.
B	Muscle control and coordination are affected.
C	Judgment and self-control are the first to be affected.
D	The drinker's brain is increasingly affected.

Question 4

When driving on a slippery road during the day, how much space should you keep ahead of your truck?

A	The same amount of space you would at night.
B	More space than is needed for ideal driving conditions.
C	One vehicle length for every 10,000 lb. of gross vehicle weight.
D	The same amount of space you would on a dry road.

Question 5

When a coolant container is part of a pressurized system, you can:

A	check the coolant level of a hot engine.
B	use windshield washer fluid as coolant.
C	safely remove the radiator cap and add coolant while the engine is hot.
D	use only water in the cooling system.

Question 6

If you become sleepy while driving, you should:

A	roll down the windows.
B	turn up the radio.
C	slap yourself in the face three times.
D	stop to sleep.

Question 7

Two things a driver can do to prevent a rollover are, to go slow around turns, and also:

A	downshift into the turn.
B	check to make sure that the brakes are properly balanced.
C	keep the cargo as close to the ground as possible.
D	keep two hands firmly planted on the steering wheel at all times.

Question 8

You know your brakes are fading when:

A	you have to push harder and harder to get the same stopping power on a downgrade.
B	the brake pedal feels firm when you apply pressure.
C	there is a slight vibration when you press down on the brake pedal.
D	you release pressure on the brake pedal and speed increases.

Question 9

Serious vehicle skids are usually caused by:

A	poorly adjusted brakes.
B	driving too slow for road conditions.
C	driving too fast for road conditions.
D	bad tires.

Question 10

The trailer hand valve (also called the trolley valve or Johnson bar) should only be used when:

A	there is ice and snow, to prevent skidding.
B	you will be parked for a short time.
C	testing the trailer brakes after hooking up to a trailer.
D	it is absolutely necessary.

Question 11

While doing the pre-trip inspection on your vehicle's steering and exhaust system you found the following problems. Which one, if any, should be fixed before you drive the vehicle?

A	Oil on the tie rod.
B	Too many vertical stacks.
C	Play in the steering wheel of more than five degrees.
D	Play in the steering wheel of more than ten degrees (two inches on a 20-inch steering wheel).

Question 12

If your vehicle has a retarder, you should turn it off when:

A	road conditions are excellent.
B	you are driving on the freeway.
C	you are driving on hilly, rural roads.
D	the road is wet, icy, or snow covered.

Question 13

You should make emergency plans when you see a hazard because:

A	you want to avoid doing something all of a sudden.
B	you want to have a plan to communicate the risk.
C	you want to have time to act before it turns into an emergency.
D	it is a federal law.

Question 14

The most important reason for conducting a pre-trip inspection of your vehicle is:

A	because it is a requirement for all drivers.
B	because law enforcement may inspect your vehicle on the road.
C	to ensure safety for yourself, your passengers, and other drivers.
D	to help ensure the vehicle will make it to your destination.

Question 15

The reason placards are used is:

A	to combat terrorism.
B	to make your vehicle look official.
C	to warn others of hazardous materials.
D	to avoid mixing hazmat with food.

Question 16

Which of the following methods should you use to test hydraulic brakes for leaks?

A	Push the brake pedal firmly 5 seconds; listen for leaks.
B	Move forward slowly and push firmly on the brake pedal.
C	Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move.
D	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.

Question 17

A trailer is more likely to swing around when the trailer wheels lock up when:

A	the trailer is being hauled at high speed.
B	the trailer is fully loaded or very heavy.
C	the trailer is out of brake adjustment.
D	the trailer is empty or lightly loaded.

Question 18

When checking the adjustment on air brakes, slack adjusters should have ______ of travel.

A	two inches
B	one inch
C	one half inch
D	three inches

Question 19

How many red reflective triangles should be in your vehicle's emergency equipment?

A	A minimum of three.
B	A minimum of two.
C	A minimum of one.
D	A minimum of four.

Question 20

Rust around a lug nut is a sign that:

A	the lug nut is cheap.
B	the lug nut is loose.
C	the lug nut needs to be replaced.
D	the wheel needs cleaning.

Question 21

Why should know the outage needed for the liquids you carry?

A	Because some of the heaviest liquids don’t need any.
B	Because tank baffles are not always legal with outage.
C	Because some liquids expand more than others when they get warm.
D	Because it's good to know that information.

Question 22

Due to its size, if your vehicle cannot make a right turn without swinging into another lane, you should ______ to prevent others from passing you on the right.

A	turn wide as you complete the turn
B	turn wide before you start the turn
C	turn right and drive over the curb
D	start the turn, then back up to re-position

Question 23

You are exiting a highway using an offramp that curves downhill and you are driving a heavy vehicle. What should you do?

A	Slow to a safe speed before the curve.
B	Turn on your four-way flashers as you approach the offramp.
C	Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp.
D	Downshift after you are in the curve.

Question 24

Empty trucks ______.

A	require greater stopping distance than full trucks
B	have the same stopping distance as full trucks
C	have better traction when stopping than full trucks
D	need less space ahead than full trucks

Question 25

How much stopping distance does a light, empty truck require, compared to the same truck fully loaded and heavy?

A	It depends on what mood you are in at the time.
B	The same amount of stopping distance.
C	Greater stopping distance.
D	Shorter stopping distance.

Question 26

The amount of liquid to load into a tank depends on:

A	neither of these.
B	the legal weight limits.
C	both of these.
D	the weight of the liquid.

Question 27

Containerized loads are:

A	exempt from height restrictions.
B	exempt from weight limit restrictions.
C	generally used when freight is carried part way by rail or ship.
D	exempt from hazardous materials restrictions.

Question 28

Before backing under, when coupling a semi-trailer to your tractor, the trailer is at the right height when:

A	the end of the kingpin is at waist level.
B	the end of the kingpin is even with the top of the fifth wheel.
C	the kingpin is about 1¼ inches above the fifth wheel.
D	it will be raised slightly when the tractor is backed under it.

Question 29

When backing your vehicle, why should you use a helper?

A	To prevent others from distracting you.
B	To direct traffic away from you.
C	To see the blind spots you can't see.
D	To watch for steering errors.

Question 30

One reason why dry bulk tanks require special care is because:

A	the load should not get wet.
B	the load can shift.
C	a dry bulk tank should only be filled halfway.
D	the load can catch fire easily.

Question 31

The braking power of the spring brakes:

A	is not affected by the condition of the service brakes.
B	decreases when the service breaks are hot.
C	depends on the service brakes being in adjustment.
D	increases when the service brakes are hot.

Question 32

Whenever you are parked at the side of the road at night, you must do which of the following?

A	Put your warning devices out within 15 minutes.
B	Warn other drivers by using your left turn signal lights.
C	Turn on your 4-way emergency flashers to warn other drivers.
D	Keep your low beam lights on.

Question 33

The minimum tread depth that front tires should have for safety is:

A	2/32-inch in every major groove.
B	3/32-inch in every major groove.
C	4/32-inch in every major groove.
D	5/32-inch in every major groove.

Question 34

When you are driving at night, you should:

A	roll down your window so that the fresh air will help keep you awake.
B	make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency.
C	keep your high beams on at all times.
D	drink coffee or other caffeine products to help keep you awake.

Question 35

What three things add up to the total stopping distance for your vehicle?

A	Perception distance, slowing distance, and braking distance.
B	Perception distance, reaction distance, and braking distance.
C	Perception distance, response distance, and reaction distance.
D	Observation distance, reaction distance, and slowing distance.

Question 36

Two main things to look for up ahead while driving are ______ and ______.

A	law enforcement officers, detours
B	tunnels, overpasses
C	vehicles, traffic signs
D	truck stops, gas stations

Question 37

When loading cargo, what is an important rule to remember?

A	Load cargo weight evenly over all the axles.
B	Load more weight over the drive axle for better traction.
C	Load more cargo toward the front of the truck for a full load.
D	Load cargo toward the rear of the truck for easier unloading.

Question 38

Before transporting a sealed load, it is important to check that the:

A	placard numbers match the seal numbers.
B	load is properly secured.
C	seal is authentic.
D	seal is secure.

Question 39

______ can cause a fire.

A	both loose fuel connections and under inflated tires
B	overinflated tires
C	loose fuel connections
D	underinflated tires

Question 40

You are operating a new truck with a manual transmission and are about to drive down a long, steep downhill grade? What should you do?

A	Use a lower gear than you would use to climb the hill.
B	Shift the truck into neutral and coast down the hill to save gas.
C	Use the same gear you would use to climb the hill.
D	Use a higher gear than you would use to climb the hill.

Question 41

Any flatbed load must have at least ______ tie downs.

A	three
B	one
C	two
D	four

Question 42

Your stopping distance will increase by ______, if you double your speed.

A	two times
B	half
C	three times
D	four times

Question 43

Which of the following is considered a hazard?

A	Road construction zones.
B	A stopped transit bus.
C	Pedestrians and bicyclists.
D	All of these are considered a hazard.

Question 44

Wheel bearing seals should be checked for ______.

A	rubbing
B	rust
C	leaks
D	burning

Question 45

Which of the following fires can be safely extinguished by water?

A	None of these fires can be safely extinguished by water.
B	Gasoline fire.
C	Grease fire.
D	Electrical fire.

Question 46

With regard to safe driving, what does communicating mean?

A	Using a helper when backing up.
B	Using hand signals.
C	Using turn signals, 4-way flashers, headlights, and the horn.
D	Using your CB radio or cell phone to inform others.

Question 47

Your ______ are the most important way to see the sides and rear of your vehicle.

A	rolled down windows
B	rear view cameras
C	sunglasses
D	mirrors

Question 48

A pre-trip inspection should be completed:

A	before operating the vehicle.
B	if any problems occurred the last the time the vehicle was operated.
C	at least once a week.
D	whenever you stop to refuel.

Question 49

The correct term for a long commercial vehicle's tendency to swing wide on turns is:

A	fishtailing.
B	offtracking.
C	sidetracking.
D	slidetracking.

Question 50

When driving a slow-moving vehicle on a 2-lane highway, you must pull off at the first safe turnout when the number of vehicles behind you is:

A	three or more.
B	seven or more.
C	five or more.
D	none of these.

Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results

There are 50 questions to complete.

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21	22	23	24	25
26	27	28	29	30
31	32	33	34	35
36	37	38	39	40
41	42	43	44	45
46	47	48	49	50
End

1	2	3	4	5
6	7	8	9	10
11	12	13	14	15
16	17	18	19	20
21	22	23	24	25
26	27	28	29	30
31	32	33	34	35
36	37	38	39	40
41	42	43	44	45
46	47	48	49	50
End

1	2	3	4	5
6	7	8	9	10
11	12	13	14	15
16	17	18	19	20
21	22	23	24	25
26	27	28	29	30
31	32	33	34	35
36	37	38	39	40
41	42	43	44	45
46	47	48	49	50
End

1	2	3	4	5
6	7	8	9	10
11	12	13	14	15
16	17	18	19	20
21	22	23	24	25
26	27	28	29	30
31	32	33	34	35
36	37	38	39	40
41	42	43	44	45
46	47	48	49	50
End

1	2	3	4	5
6	7	8	9	10
11	12	13	14	15
16	17	18	19	20
21	22	23	24	25
26	27	28	29	30
31	32	33	34	35
36	37	38	39	40
41	42	43	44	45
46	47	48	49	50
End