Wheeled suitcase and plough: what they have in common

1. Step 1. Wheeled suitcase — has part — Wheel. Little wheels.
2. Step 2. Wheel — is part of — Stagecoach. On four wheels.
3. Step 3. Stagecoach — uses — Horse collar. It is pulled by horses.
4. Step 4. Horse collar — is used in — Plough. The horse collar made ploughing with horses possible.

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