Odometer and tank: what they have in common

1. Step 1. Odometer — is part of — Dashboard. An odometer.
2. Step 2. Dashboard — is part of — Car. Gauges.
3. Step 3. Car — evolved into — Armoured car. A car with armour.
4. Step 4. Armoured car — evolved into — Tank. The tank combined the armour of an armoured car with the off-road ability of tracks.

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