Oklahoma General Knowledge Practice Test

This is our Oklahoma 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

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

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

Question 2

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

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

Question 3

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

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

Question 4

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

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

Question 5

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

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

Question 6

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

A	three times
B	four times
C	half
D	two times

Question 7

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	because law enforcement may inspect your vehicle on the road.
C	to help ensure the vehicle will make it to your destination.
D	because it is a requirement for all drivers.

Question 8

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 9

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 10

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 11

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 12

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 empty or lightly loaded.
D	the trailer is out of brake adjustment.

Question 13

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 14

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

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

Question 15

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

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

Question 16

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

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

Question 17

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

Question 18

Wheel bearing seals should be checked for ______.

A	rubbing
B	leaks
C	burning
D	rust

Question 19

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

Question 20

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 21

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

Question 22

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 it's good to know that information.
D	Because some liquids expand more than others when they get warm.

Question 23

______ can cause a fire.

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

Question 24

Any flatbed load must have at least ______ tie downs.

A	three
B	two
C	one
D	four

Question 25

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

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

Question 26

Which of the following is considered a hazard?

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

Question 27

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	downshift into the turn.
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 28

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

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

Question 29

Containerized loads are:

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

Question 30

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

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

Question 31

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

Question 32

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

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

Question 33

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	whenever you stop to refuel.
D	at least once a week.

Question 34

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

Question 35

You know your brakes are fading when:

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

Question 36

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

Question 37

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

A	Load more weight over the drive axle for better traction.
B	Load cargo weight evenly over all the axles.
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

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

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

Question 39

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 40

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	Keep your low beam lights on.
D	Warn other drivers by using your left turn signal lights.

Question 41

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

Question 42

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 43

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

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

Question 44

With regard to safe driving, what does communicating mean?

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

Question 45

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

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

Question 46

Serious vehicle skids are usually caused by:

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

Question 47

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	roll down your window so that the fresh air will help keep you awake.
C	keep your high beams on at all times.
D	drink coffee or other caffeine products to help keep you awake.

Question 48

If you become sleepy while driving, you should:

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

Question 49

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

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

Question 50

The reason placards are used is:

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

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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

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 2

The braking power of the spring brakes:

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

Question 3

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

Question 4

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 5

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	use windshield washer fluid as coolant.
C	use only water in the cooling system.
D	check the coolant level of a hot engine.

Question 6

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

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

Question 7

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 8

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

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

Question 9

Any flatbed load must have at least ______ tie downs.

A	four
B	two
C	three
D	one

Question 10

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

A	four times
B	half
C	three times
D	two times

Question 11

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

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

Question 12

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

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

Question 13

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

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

Question 14

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 two hands firmly planted on the steering wheel at all times.
C	keep the cargo as close to the ground as possible.
D	downshift into the turn.

Question 15

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

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

Question 16

A pre-trip inspection should be completed:

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

Question 17

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 18

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 19

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

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

Question 20

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

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

Question 21

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	Slow to a safe speed before the curve.
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 22

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 23

With regard to safe driving, what does communicating mean?

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

Question 24

Rust around a lug nut is a sign that:

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

Question 25

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 26

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

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

Question 27

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	three or more.
D	five or more.

Question 28

The reason placards are used is:

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

Question 29

Wheel bearing seals should be checked for ______.

A	rust
B	leaks
C	burning
D	rubbing

Question 30

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 31

______ can cause a fire.

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

Question 32

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 33

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 ten degrees (two inches on a 20-inch steering wheel).
D	Play in the steering wheel of more than five degrees.

Question 34

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

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

Question 35

Which of the following is considered a hazard?

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

Question 36

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	because law enforcement may inspect your vehicle on the road.
C	because it is a requirement for all drivers.
D	to help ensure the vehicle will make it to your destination.

Question 37

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 38

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 tank baffles are not always legal with outage.
D	Because it's good to know that information.

Question 39

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 40

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

Question 41

Containerized loads are:

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

Question 42

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

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

Question 43

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 going up a hill.
D	before starting down a hill and before entering a tunnel.

Question 44

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 at waist level.
C	the end of the kingpin is even with the top of the fifth wheel.
D	the kingpin is about 1¼ inches above the fifth wheel.

Question 45

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 a higher gear than you would use to climb the hill.
C	Use the same gear you would use to climb the hill.
D	Use a lower gear than you would use to climb the hill.

Question 46

Serious vehicle skids are usually caused by:

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

Question 47

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 48

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

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

Question 49

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 50

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 fully loaded or very heavy.
C	the trailer is being hauled at high speed.
D	the trailer is empty or lightly loaded.

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