Synthetic dye and knife: what they have in common

1. Step 1. Synthetic dye — evolved from — Indigo. Synthesizing natural dyes.
2. Step 2. Indigo — is used in — Jeans. Indigo.
3. Step 3. Jeans — is a kind of — Trousers. Trousers.
4. Step 4. Trousers — uses — Needle. Trousers were sewn with a needle.
5. Step 5. Needle — is part of — Overlocker. Needles sew the stitch.
6. Step 6. Overlocker — has part — Knife. A knife for trimming the edge.

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