Screw-cutting lathe and plough: what they have in common

1. Step 1. Screw-cutting lathe — uses — Screw thread. The lathe cuts precise standard threads.
2. Step 2. Screw thread — is used in — Screwdriver. It drives screws.
3. Step 3. Screwdriver — has part — Handle. A handle.
4. Step 4. Handle — is part of — Plough. Handles for steering the plough.

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