Bridge and r-7 rocket: what they have in common

1. Step 1. Bridge — is part of — Interchange. Flyovers.
2. Step 2. Interchange — is made of — Concrete. The flyovers are concrete.
3. Step 3. Concrete — is material for — Launch complex. The launch table is concrete.
4. Step 4. Launch complex — is used in — R-7 rocket. Baikonur.

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