Replaceable blade and shaduf: what they have in common

1. Step 1. Replaceable blade — is part of — Safety razor. A thin steel blade.
2. Step 2. Safety razor — uses — Wedge. The blade is a wedge.
3. Step 3. Wedge — is used in — Harpoon. A barbed point enters like a wedge and does not come back out.
4. Step 4. Harpoon — has part — Rope. A line connects the head to the hunter.
5. Step 5. Rope — is used in — Well. Water was raised with a bucket on a rope.
6. Step 6. Well — uses — Shaduf. Or with a well sweep.

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