Respirator and personal computer: what they have in common

1. Step 1. Respirator — is made of — Activated carbon. The filter is activated carbon.
2. Step 2. Activated carbon — is a kind of — Carbon. Porous carbon.
3. Step 3. Carbon — is material for — Laser printer. Toner is carbon black in resin.
4. Step 4. Laser printer — is used in — Desktop publishing. Output to a laser printer.
5. Step 5. Desktop publishing — uses — Personal computer. Page layout on a PC.

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