Throwing arm and gas lamp: what they have in common

1. Step 1. Throwing arm — is part of — Trebuchet. A long arm with a sling.
2. Step 2. Trebuchet — is made of — Stone. It hurled stone balls.
3. Step 3. Stone — is material for — Stadium. Ancient stadiums had stone stands.
4. Step 4. Stadium — has part — Street light. Floodlights.
5. Step 5. Street light — evolved from — Gas lamp. Gas lamps.

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