Interchange and Babbage’s Analytical Engine: what they have in common

1. Step 1. Interchange — is made of — Concrete. The flyovers are concrete.
2. Step 2. Concrete — is used in — Concrete mixer. It mixes concrete.
3. Step 3. Concrete mixer — has part — Gear. The drum’s ring gear.
4. Step 4. Gear — is part of — Babbage’s Analytical Engine. Gears performed the calculations.

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