Smoking and rope: what they have in common

1. Step 1. Smoking — uses — Combustion. The smoke of smouldering wood.
2. Step 2. Combustion — is used in — Fire making. Fire is combustion.
3. Step 3. Fire making — uses — Bow drill. The bow drill is a way of making fire.
4. Step 4. Bow drill — has part — Rope. The bowstring wraps around the drill.

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