Maryland General Knowledge Practice Test

This is our Maryland 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

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 2

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	it will be raised slightly when the tractor is backed under it.
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 3

If you become sleepy while driving, you should:

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

Question 4

Containerized loads are:

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

Question 5

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 6

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 7

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	Electrical fire.
D	Grease fire.

Question 8

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 9

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	Turn on your four-way flashers as you approach the offramp.
D	Slow to a safe speed before the curve.

Question 10

Rust around a lug nut is a sign that:

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

Question 11

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

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

Question 12

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 13

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

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

Question 14

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 authentic.
D	seal is secure.

Question 15

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	a dry bulk tank should only be filled halfway.
D	the load can shift.

Question 16

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

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

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

Question 18

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

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

Question 19

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 20

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 21

A pre-trip inspection should be completed:

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

Question 22

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

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

Question 23

Empty trucks ______.

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

Question 24

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 25

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 26

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 27

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

Question 28

______ can cause a fire.

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

Question 29

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	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 lower gear than you would use to climb the hill.

Question 30

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 31

With regard to safe driving, what does communicating mean?

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

Question 32

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, slowing distance, and braking distance.
D	Perception distance, reaction distance, and braking distance.

Question 33

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	poor-quality retreads, under-inflated tires
D	dual tires that touch, hot road surfaces

Question 34

Which of the following is considered a hazard?

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

Question 35

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

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

Question 36

Wheel bearing seals should be checked for ______.

A	rust
B	rubbing
C	burning
D	leaks

Question 37

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

A	half
B	two times
C	four times
D	three times

Question 38

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

Question 39

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

Question 40

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 41

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

Question 42

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

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

Question 43

Any flatbed load must have at least ______ tie downs.

A	two
B	three
C	one
D	four

Question 44

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	check the coolant level of a hot engine.
D	use only water in the cooling system.

Question 45

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

Question 46

Serious vehicle skids are usually caused by:

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

Question 47

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

Question 48

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	The drinker's brain is increasingly affected.
D	Muscle control and coordination are affected.

Question 49

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	the road is wet, icy, or snow covered.
D	road conditions are excellent.

Question 50

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.

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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

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

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

Question 3

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

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

Question 4

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	seven or more.
D	none of these.

Question 5

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

A	you want to have a plan to communicate the risk.
B	it is a federal law.
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 6

With regard to safe driving, what does communicating mean?

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

Question 7

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 8

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 9

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

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

Question 10

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	More space than is needed for ideal driving conditions.
D	The same amount of space you would at night.

Question 11

Any flatbed load must have at least ______ tie downs.

A	three
B	two
C	four
D	one

Question 12

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 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 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 14

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	3/32-inch in every major groove.
D	4/32-inch in every major groove.

Question 15

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 some of the heaviest liquids don’t need any.
C	Because it's good to know that information.
D	Because tank baffles are not always legal with outage.

Question 16

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

Question 17

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

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

Question 18

The braking power of the spring brakes:

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

Question 19

A pre-trip inspection should be completed:

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

Question 20

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

A	three times
B	half
C	four times
D	two times

Question 21

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

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

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	keep two hands firmly planted on the steering wheel at all times.
C	downshift into the turn.
D	check to make sure that the brakes are properly balanced.

Question 23

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 24

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

Question 25

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	Judgment and self-control are the first to be affected.
D	Muscle control and coordination are affected.

Question 26

If you become sleepy while driving, you should:

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

Question 27

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

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

Question 28

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

Question 29

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 30

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

A	Load more weight over the drive axle for better traction.
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 cargo toward the rear of the truck for easier unloading.

Question 31

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

Question 32

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

Question 33

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

Question 34

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	Electrical fire.
D	Grease fire.

Question 35

Containerized loads are:

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

Question 36

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 37

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

Question 38

Which of the following is considered a hazard?

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

Question 39

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 empty or lightly loaded.
C	the trailer is being hauled at high speed.
D	the trailer is out of brake adjustment.

Question 40

Wheel bearing seals should be checked for ______.

A	rust
B	burning
C	leaks
D	rubbing

Question 41

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

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

Question 42

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

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

Question 43

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

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

Question 44

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 45

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 secure.
D	seal is authentic.

Question 46

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, reaction distance, and braking distance.
D	Perception distance, response distance, and reaction distance.

Question 47

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 48

______ can cause a fire.

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

Question 49

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 50

The reason placards are used is:

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

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