In four stroke cycle engines, to complete one cycle it needs four piston strokes. There will be two valves: intake valve and exhaust valve.
The four piston strokes are
Intake
Compression
Ignition
Exhaust
Question : Which of the following is not a valid stroke in a swimming competition?
Option 1: Breast stroke
Option 2: Front stroke
Option 3: Leg stroke
Option 4: Back stroke
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