Anti-aircraft gun and zip: what they have in common

1. Step 1. Anti-aircraft gun — is a kind of — Cannon. A gun.
2. Step 2. Cannon — is part of — Galleon. Cannons on the decks.
3. Step 3. Galleon — evolved into — Clipper. The sailing fleet developed towards speed.
4. Step 4. Clipper — is made of — Cotton. The sails are cotton canvas.
5. Step 5. Cotton — is material for — Jeans. Denim.
6. Step 6. Jeans — has part — Zip. A zip.

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