Wooden harness arch and electric fan: what they have in common

1. Step 1. Wooden harness arch — is part of — Horse collar. An arch over the neck (Russian harness).
2. Step 2. Horse collar — is made of — Leather. The collar and traces are leather.
3. Step 3. Leather — is material for — Submarine. It was covered with leather.
4. Step 4. Submarine — has part — Propeller. A propeller.
5. Step 5. Propeller — is part of — Electric fan. The blades.

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