Oxygen and zip: what they have in common

1. Step 1. Oxygen — is material for — R-7 rocket. The oxidizer is liquid oxygen.
2. Step 2. R-7 rocket — is used in — Vostok 1. Launched by a version of the R-7.
3. Step 3. Vostok 1 — uses — Spacesuit. The SK-1 spacesuit.
4. Step 4. Spacesuit — is made of — Nylon. The outer layer is nylon and other synthetic fabrics.
5. Step 5. Nylon — is material for — Backpack. Nylon.
6. Step 6. Backpack — has part — Zip. Zips.

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