Wagonway and sonar: what they have in common

1. Step 1. Wagonway — has part — Cart. Wagons rolled on the rails.
2. Step 2. Cart — evolved into — Chariot. A chariot is a lightened cart.
3. Step 3. Chariot — is made of — Leather. The floor was woven from leather straps.
4. Step 4. Leather — is material for — Submarine. It was covered with leather.
5. Step 5. Submarine — has part — Sonar. Underwater acoustics.

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