Answer:
intake, compression, combusion, and exhaust
1.The first stroke that is intake is the movement of a valve , which opens into the cylinder which contains a moving piston which moves 50 times a second , the opening of the valve lets the fuel to get into the cylinder (the fuel is the mixture of air and fuel that can be diesel or patrol the air is mixed into it to make more compression as the air is more compressible
2. The second stroke is compression that is done by a piston in the cylinder by moving up thus high amount of pressure and temprature.
3. The third stroke is the power or the bang stroke which is done when the piston colides with the top dead centre it ignites due to compression and high temprature which leads to friction
4. The last stroke is the exaust stroke whic is the opening of the second valve and outgoing of ethe waste air