Sail and electric motor: what they have in common

1. Step 1. Sail — is part of — Sailing ship. Sails drive the ship.
2. Step 2. Sailing ship — is used in — Seaport. A port receives ships.
3. Step 3. Seaport — has part — Container crane. Container cranes.
4. Step 4. Container crane — has part — Electric motor. Drives.

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