Parachute canopy and zip: what they have in common

1. Step 1. Parachute canopy — is part of — Parachute. Cloth that creates air resistance.
2. Step 2. Parachute — is made of — Nylon. Modern canopies are sewn from nylon.
3. Step 3. Nylon — is material for — Backpack. Nylon.
4. Step 4. Backpack — has part — Zip. Zips.

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