Container ship and shaduf: what they have in common

1. Step 1. Container ship — uses — Shipping container. Carries standard containers.
2. Step 2. Shipping container — works like — Pallet. Standardizing units of cargo.
3. Step 3. Pallet — is used in — Forklift. It works with pallets.
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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