Incubator and steam locomotive: what they have in common

1. Step 1. Incubator — uses — Combustion. They were heated by fire.
2. Step 2. Combustion — is used in — Heating stove. Burning wood.
3. Step 3. Heating stove — has part — Chimney. A chimney.
4. Step 4. Chimney — is part of — Steam locomotive. Smoke from the firebox leaves through the locomotive's chimney.

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