Horseshoe and oil lamp: what they have in common

1. Step 1. Horseshoe — is made of — Iron. Iron.
2. Step 2. Iron — is material for — Davy lamp. The lamp’s gauze is iron.
3. Step 3. Davy lamp — has part — Wick. A wick.
4. Step 4. Wick — is part of — Oil lamp. The wick feeds oil to the flame.

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