Bow drill and r-7 rocket: what they have in common

1. Step 1. Bow drill — has part — Rope. The bowstring wraps around the drill.
2. Step 2. Rope — is part of — Parachute. The lines are ropes.
3. Step 3. Parachute — is part of — Soyuz. Landing by parachute.
4. Step 4. Soyuz — evolved from — R-7 rocket. The Soyuz rocket belongs to the R-7 family.

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