Bolt action and kite: what they have in common

1. Step 1. Bolt action — is part of — Rifle. A shutter.
2. Step 2. Rifle — has part — Trigger. The trigger releases the firing pin and the rifle fires.
3. Step 3. Trigger — is part of — Crossbow. A trigger.
4. Step 4. Crossbow — evolved from — Bow and arrow. A bow on a stock.
5. Step 5. Bow and arrow — has part — Rope. The bowstring is a cord of sinew or fibre.
6. Step 6. Rope — is part of — Kite. The line holds the kite and passes the tension to the hand.

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