Hub motor and internal combustion engine: what they have in common

1. Step 1. Hub motor — is part of — Electric bicycle. A hub motor or a mid-drive motor.
2. Step 2. Electric bicycle — has part — Roller chain. The chain drive from the pedals remains.
3. Step 3. Roller chain — is part of — Chainsaw. The cutting chain is a roller chain with teeth.
4. Step 4. Chainsaw — has part — Internal combustion engine. A two-stroke engine.

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