Counterweight and internal combustion engine: what they have in common

1. Step 1. Counterweight — is used in — Forklift. A counterweight.
2. Step 2. Forklift — has part — Hydraulic cylinder. Lifting the forks.
3. Step 3. Hydraulic cylinder — has part — Piston. The piston is moved by liquid.
4. Step 4. Piston — is part of — Internal combustion engine. The burning mixture pushes the piston.

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