Reins and internal combustion engine: what they have in common

1. Step 1. Reins — is part of — Bit and bridle. Control.
2. Step 2. Bit and bridle — is made of — Leather. A bridle is leather straps.
3. Step 3. Leather — is material for — Piston. They were sealed with a leather cup.
4. Step 4. Piston — is part of — Internal combustion engine. The burning mixture pushes the piston.

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