Robot vacuum and zip: what they have in common

1. Step 1. Robot vacuum — evolved from — Vacuum cleaner. An autonomous vacuum cleaner.
2. Step 2. Vacuum cleaner — is made of — Cotton. The dust bag is a cloth bag.
3. Step 3. Cotton — is material for — Jeans. Denim.
4. Step 4. Jeans — has part — Zip. A zip.

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