Wooden stilts and kiln: what they have in common

1. Step 1. Wooden stilts — is part of — Stilts. Two long supports.
2. Step 2. Stilts — uses — Lever. An extended support.
3. Step 3. Lever — is used in — Railway coupling. It is locked with a lever.
4. Step 4. Railway coupling — is part of — Steam locomotive. A locomotive hooks up its wagons with a coupling.
5. Step 5. Steam locomotive — has part — Chimney. Smoke from the firebox leaves through the locomotive's chimney.
6. Step 6. Chimney — is part of — Kiln. The chimney creates a draught.

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