South Dakota General Knowledge Practice Test

This is our South Dakota 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 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 2

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 3

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

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

Question 4

Any flatbed load must have at least ______ tie downs.

A	four
B	three
C	one
D	two

Question 5

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

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

Question 6

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

Question 7

______ can cause a fire.

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

Question 8

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

Question 9

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 10

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

Question 11

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

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

Question 12

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 13

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

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

Question 14

You know your brakes are fading when:

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

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 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 16

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

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

Question 17

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 18

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 toward the rear of the truck for easier unloading.
C	Load more weight over the drive axle for better traction.
D	Load cargo weight evenly over all the axles.

Question 19

Wheel bearing seals should be checked for ______.

A	rubbing
B	rust
C	burning
D	leaks

Question 20

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

Question 22

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 23

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

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

Question 24

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 25

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 26

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 27

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

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

Question 28

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 29

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	Too many vertical stacks.
D	Oil on the tie rod.

Question 30

Empty trucks ______.

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

Question 31

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	Warn other drivers by using your left turn signal lights.
C	Put your warning devices out within 15 minutes.
D	Keep your low beam lights on.

Question 32

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

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

Question 33

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 34

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 35

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

Question 36

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

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

Question 37

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

A	three times
B	two times
C	half
D	four times

Question 38

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

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

Question 39

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

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

Question 40

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

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

Question 41

Which of the following is considered a hazard?

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

Question 42

The reason placards are used is:

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

Question 43

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	keep your high beams on at all times.
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 44

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 45

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 46

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

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

Question 47

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

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

Question 48

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 49

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	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 at night.

Question 50

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.

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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

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

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

Question 2

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 3

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 4

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 5

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 it's good to know that information.
D	Because some of the heaviest liquids don’t need any.

Question 6

With regard to safe driving, what does communicating mean?

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

Question 7

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 8

You know your brakes are fading when:

A	the brake pedal feels firm when you apply pressure.
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	there is a slight vibration when you press down on the brake pedal.

Question 9

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

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

Question 10

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

A	half
B	three times
C	four times
D	two times

Question 11

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

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

Question 12

Any flatbed load must have at least ______ tie downs.

A	one
B	three
C	two
D	four

Question 13

Containerized loads are:

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

Question 14

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

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

Question 15

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

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

Question 16

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

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

Question 17

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	One vehicle length for every 10,000 lb. of gross vehicle weight.
C	The same amount of space you would at night.
D	The same amount of space you would on a dry road.

Question 18

The braking power of the spring brakes:

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

Question 19

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 20

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 21

Wheel bearing seals should be checked for ______.

A	rust
B	leaks
C	rubbing
D	burning

Question 22

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 23

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 out of brake adjustment.
C	the trailer is fully loaded or very heavy.
D	the trailer is empty or lightly loaded.

Question 24

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 25

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 26

The reason placards are used is:

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

Question 27

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

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

Question 28

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 29

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

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

Question 30

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

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

Question 31

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

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

Question 32

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 33

______ can cause a fire.

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

Question 34

A pre-trip inspection should be completed:

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

Question 35

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

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

Question 36

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

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

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

Question 38

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	Grease fire.
D	Gasoline fire.

Question 39

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

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

Question 40

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 41

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 42

Which of the following is considered a hazard?

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

Question 43

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

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

Question 44

Serious vehicle skids are usually caused by:

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

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

Question 46

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

Question 47

Empty trucks ______.

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

Question 48

If you become sleepy while driving, you should:

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

Question 49

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	seven or more.
C	three or more.
D	five or more.

Question 50

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

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

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