Tall wooden churn and plough: what they have in common

1. Step 1. Tall wooden churn — is part of — Butter churn. A tall narrow container.
2. Step 2. Butter churn — uses — Lever. A dasher.
3. Step 3. Lever — is used in — Hoe. The handle works as a lever when loosening soil.
4. Step 4. Hoe — evolved into — Plough. The plough mechanized loosening the soil with a hoe.

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