Carburettor and saw: what they have in common

1. Step 1. Carburettor — is part of — Internal combustion engine. Petrol engines mixed fuel and air in a carburettor until the 1980s–90s; modern engines use fuel injection instead.
2. Step 2. Internal combustion engine — is part of — Chainsaw. A two-stroke engine.
3. Step 3. Chainsaw — evolved from — Saw. A mechanized saw.

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