Wallet bill compartment and windlass: what they have in common

1. Step 1. Wallet bill compartment — is part of — Wallet. A long pocket.
2. Step 2. Wallet — is made of — Leather. Leather.
3. Step 3. Leather — is material for — Siege tower. They were covered with raw hides against fire.
4. Step 4. Siege tower — has part — Wheel. On wheels.
5. Step 5. Wheel — is used in — Windlass. A windlass is a wheel and axle used as a simple machine.

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