Antivirus and paper machine: what they have in common

1. Step 1. Antivirus — uses — Computer virus. It fights viruses.
2. Step 2. Computer virus — is a kind of — Software. A program.
3. Step 3. Software — includes — Database. Software.
4. Step 4. Database — evolved from — Hollerith tabulator. Processing large datasets began with tabulators.
5. Step 5. Hollerith tabulator — is made of — Cast iron. The casing is cast iron.
6. Step 6. Cast iron — is material for — Paper machine. The rolls are cast iron.

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