Billiards and cannon: what they have in common

1. Step 1. Billiards — is made of — Wool. The baize.
2. Step 2. Wool — is part of — Spring mattress. A layer of wool or felt over the springs keeps them from being felt.
3. Step 3. Spring mattress — is made of — Cotton. The cover is cotton fabric.
4. Step 4. Cotton — is material for — Clipper. The sails are cotton canvas.
5. Step 5. Clipper — evolved from — Galleon. The sailing fleet developed towards speed.
6. Step 6. Galleon — has part — Cannon. Cannons on the decks.

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