Rudder and saw: what they have in common

1. Step 1. Rudder — is part of — Sailing ship. A steering wheel.
2. Step 2. Sailing ship — evolved from — Boat. Sailing ships grew out of rowing boats.
3. Step 3. Boat — has part — Oar. A boat was moved by oars.
4. Step 4. Oar — has part — Handle. A beater for hand washing.
5. Step 5. Handle — is part of — Saw. A handle.

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