Pennsylvania General Knowledge Practice Test

This is our Pennsylvania 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 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 2

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 3

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

Question 4

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

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

Question 5

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 6

If you become sleepy while driving, you should:

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

Question 7

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 8

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 9

______ can cause a fire.

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

Question 10

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

A	four times
B	three times
C	two times
D	half

Question 11

Rust around a lug nut is a sign that:

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

Question 12

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 13

With regard to safe driving, what does communicating mean?

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

Question 14

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

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

Question 15

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	downshift into the turn.
D	keep two hands firmly planted on the steering wheel at all times.

Question 16

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

Question 17

Any flatbed load must have at least ______ tie downs.

A	four
B	two
C	one
D	three

Question 18

Empty trucks ______.

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

Question 19

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 20

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	it will be raised slightly when the tractor is backed under it.
D	the kingpin is about 1¼ inches above the fifth wheel.

Question 21

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

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

Question 22

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 height restrictions.
D	exempt from weight limit restrictions.

Question 23

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

Question 24

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

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

Question 25

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

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

Question 26

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

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

Question 27

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

Question 28

The reason placards are used is:

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

Question 29

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 30

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 31

Wheel bearing seals should be checked for ______.

A	burning
B	rubbing
C	leaks
D	rust

Question 32

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

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

Question 33

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	Keep your low beam lights on.
D	Turn on your 4-way emergency flashers to warn other drivers.

Question 34

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 35

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

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

Question 36

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

Question 37

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 time to act before it turns into an emergency.
C	you want to have a plan to communicate the risk.
D	it is a federal law.

Question 38

The braking power of the spring brakes:

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

Question 39

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 40

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 41

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

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

Question 42

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 43

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 44

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 45

Serious vehicle skids are usually caused by:

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

Question 46

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

Question 47

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 two.
D	A minimum of three.

Question 48

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 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 weight evenly over all the axles.

Question 49

When you are driving at night, you should:

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

Question 50

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

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

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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

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

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

Question 2

If you become sleepy while driving, you should:

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

Question 3

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

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

Question 4

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

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

Question 5

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 6

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	you will be parked for a short time.
C	it is absolutely necessary.
D	there is ice and snow, to prevent skidding.

Question 7

______ can cause a fire.

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

Question 8

Wheel bearing seals should be checked for ______.

A	burning
B	rust
C	rubbing
D	leaks

Question 9

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	The same amount of space you would on a dry road.
C	More space than is needed for ideal driving conditions.
D	The same amount of space you would at night.

Question 10

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

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

Question 11

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

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

Question 12

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

Question 13

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 can catch fire easily.
D	the load should not get wet.

Question 14

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

Question 16

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

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

Question 17

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

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

Question 18

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 19

Containerized loads are:

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

Question 20

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

Question 21

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 watch for steering errors.
D	To see the blind spots you can't see.

Question 22

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 only water in the cooling system.
D	use windshield washer fluid as coolant.

Question 23

With regard to safe driving, what does communicating mean?

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

Question 24

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

Question 25

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

Question 26

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

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

Question 27

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 28

Rust around a lug nut is a sign that:

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

Question 29

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.

Question 30

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 31

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

A	three times
B	four times
C	half
D	two times

Question 32

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 33

A pre-trip inspection should be completed:

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

Question 34

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

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

Question 35

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

Question 36

Serious vehicle skids are usually caused by:

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

Question 37

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

Question 38

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 39

Any flatbed load must have at least ______ tie downs.

A	two
B	one
C	four
D	three

Question 40

Empty trucks ______.

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

Question 41

When you are driving at night, you should:

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

Question 42

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 43

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	Downshift after you are in the curve.
C	Turn on your four-way flashers as you approach the offramp.
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 44

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

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

Question 45

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

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

Question 46

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

Question 47

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

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

Question 48

The braking power of the spring brakes:

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

Question 49

Which of the following is considered a hazard?

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

Question 50

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	Observation distance, reaction distance, and slowing distance.
D	Perception distance, response distance, and reaction distance.

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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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