Texas General Knowledge Practice Test

This is our Texas 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

Containerized loads are:

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

Question 2

Rust around a lug nut is a sign that:

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

Question 3

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

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

Question 4

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

Question 5

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

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

Question 6

With regard to safe driving, what does communicating mean?

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

Question 7

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 8

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	Downshift after you are in 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 9

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	it is absolutely necessary.
C	you will be parked for a short time.
D	testing the trailer brakes after hooking up to a trailer.

Question 10

The braking power of the spring brakes:

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

Question 11

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

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

Question 12

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

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

Question 13

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

Question 14

Serious vehicle skids are usually caused by:

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

Question 15

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

Question 16

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

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

Question 17

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

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

Question 18

A pre-trip inspection should be completed:

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

Question 19

The reason placards are used is:

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

Question 20

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

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

Question 21

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

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

Question 22

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	poor-quality retreads, under-inflated tires
D	over-heated brakes, under-inflated tires

Question 23

Empty trucks ______.

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

Question 24

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 25

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

Question 26

______ can cause a fire.

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

Question 27

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

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

Question 28

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

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

Question 29

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

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

Question 30

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

Question 31

Any flatbed load must have at least ______ tie downs.

A	four
B	two
C	one
D	three

Question 32

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

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

Question 33

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

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

Question 34

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

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

Question 35

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

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

Question 36

Which of the following is considered a hazard?

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

Question 37

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

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

Question 38

Wheel bearing seals should be checked for ______.

A	burning
B	rust
C	leaks
D	rubbing

Question 39

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

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

Question 40

When you are driving at night, you should:

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

Question 41

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

A	half
B	two times
C	four times
D	three times

Question 42

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

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

Question 43

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

Question 44

If you become sleepy while driving, you should:

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

Question 45

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

Question 46

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 47

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

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

Question 48

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	The same amount of stopping distance.
D	Shorter stopping distance.

Question 49

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

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

Question 50

The two driving conditions in which you should downshift are:

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

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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 amount of liquid to load into a tank depends on:

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

Question 2

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

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

Question 3

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 4

Wheel bearing seals should be checked for ______.

A	rust
B	leaks
C	rubbing
D	burning

Question 5

Rust around a lug nut is a sign that:

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

Question 6

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

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

Question 7

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

A	check the coolant level of a hot engine.
B	safely remove the radiator cap and add coolant while the engine is hot.
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	if any problems occurred the last the time the vehicle was operated.
B	before operating the vehicle.
C	at least once a week.
D	whenever you stop to refuel.

Question 9

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

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

Question 10

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	Turn on your 4-way emergency flashers to warn other drivers.
D	Put your warning devices out within 15 minutes.

Question 11

Containerized loads are:

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

Question 12

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	it is absolutely necessary.
D	testing the trailer brakes after hooking up to a trailer.

Question 13

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

Question 14

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

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

Question 15

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

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

Question 16

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

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

Question 17

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

Question 18

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

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

Question 19

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

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

Question 20

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 21

The reason placards are used is:

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

Question 22

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

A	half
B	four times
C	three times
D	two times

Question 23

Which of the following is considered a hazard?

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

Question 24

The two driving conditions in which you should downshift are:

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

Question 25

When you are driving at night, you should:

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

Question 26

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

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

Question 27

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

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

Question 28

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

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

Question 29

Serious vehicle skids are usually caused by:

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

Question 30

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 31

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

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

Question 32

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

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

Question 33

The braking power of the spring brakes:

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

Question 34

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

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

Question 35

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

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

Question 36

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

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

Question 37

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	start the turn, then back up to re-position
D	turn right and drive over the curb

Question 38

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 even with the top of the fifth wheel.
B	the end of the kingpin is at waist level.
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 39

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

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

Question 40

______ can cause a fire.

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

Question 41

With regard to safe driving, what does communicating mean?

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

Question 42

Empty trucks ______.

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

Question 43

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

A	Downshift after you are in 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	Slow to a safe speed before the curve.

Question 44

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	you release pressure on the brake pedal and speed increases.
C	the brake pedal feels firm when you apply pressure.
D	there is a slight vibration when you press down on the brake pedal.

Question 45

Any flatbed load must have at least ______ tie downs.

A	one
B	two
C	four
D	three

Question 46

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	five or more.
C	seven or more.
D	none of these.

Question 47

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

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

Question 48

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

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

Question 49

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

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

Question 50

If you become sleepy while driving, you should:

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

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.

←

List

→

Return

Shaded items are complete.

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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