Segway and shaduf: what they have in common

1. Step 1. Segway — has part — Lithium-ion battery. A battery.
2. Step 2. Lithium-ion battery — is part of — Warehouse robot. A battery.
3. Step 3. Warehouse robot — evolved from — Forklift. Automating warehouses.
4. Step 4. Forklift — uses — Counterweight. A counterweight.
5. Step 5. Counterweight — is used in — Shaduf. The counterweight makes lifting the bucket easier.

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