First aid kit and saw: what they have in common

1. Step 1. First aid kit — has part — Tourniquet. A tourniquet.
2. Step 2. Tourniquet — has part — Screw thread. Petit’s tourniquet was tightened with a screw.
3. Step 3. Screw thread — is used in — Screwdriver. It drives screws.
4. Step 4. Screwdriver — has part — Handle. A handle.
5. Step 5. Handle — is part of — Saw. A handle.

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