Whistling kettle and rope: what they have in common

1. Step 1. Whistling kettle — has part — Whistle. A whistle.
2. Step 2. Whistle — is made of — Bone. Ancient whistles were carved from bone.
3. Step 3. Bone — is material for — Harpoon. The oldest harpoons (Katanda, ~90,000 years ago) are carved from bone.
4. Step 4. Harpoon — has part — Rope. A line connects the head to the hunter.

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