Printer and conveyor belt: what they have in common

1. Step 1. Printer — uses — Ink. It prints with ink.
2. Step 2. Ink — is used in — Ballpoint pen. Thick oil-based ink.
3. Step 3. Ballpoint pen — has part — Ball bearing. A ball in a socket — essentially a ball bearing.
4. Step 4. Ball bearing — is part of — Conveyor belt. The rollers turn on bearings.

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