Flip-flop and shipping container: what they have in common

1. Step 1. Flip-flop — is part of — Microprocessor. Registers are flip-flops.
2. Step 2. Microprocessor — is part of — Anti-lock braking system (ABS). A control unit.
3. Step 3. Anti-lock braking system (ABS) — evolved from — Air brake. Anti-skid systems first appeared in aviation and on railways.
4. Step 4. Air brake — is part of — Truck. Air brakes, as on trains.
5. Step 5. Truck — uses — Shipping container. A container moves from ship to truck without being unloaded.

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