Billiards and needle: what they have in common

1. Step 1. Billiards — is made of — Wool. The baize.
2. Step 2. Wool — is material for — Trousers. The oldest trousers (Yanghai) were sewn from wool.
3. Step 3. Trousers — uses — Needle. Trousers were sewn with a needle.

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