Interlinked metal rings and syringe: what they have in common

1. Step 1. Interlinked metal rings — is part of — Scissors. Finger rings.
2. Step 2. Scissors — uses — Wedge. The blades cut like wedges.
3. Step 3. Wedge — is used in — Needle. The point pushes the material apart like a wedge.
4. Step 4. Needle — is part of — Syringe. A hollow needle.

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