Ski tip and gas lamp: what they have in common

1. Step 1. Ski tip — is part of — Skis. A bent end.
2. Step 2. Skis — uses — Friction. Gliding over snow.
3. Step 3. Friction — is used in — Match. It lights by friction.
4. Step 4. Match — uses — Combustion. Combustion.
5. Step 5. Combustion — is used in — Gas lamp. The flame gives the light.

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