Magnetic-core memory and paper machine: what they have in common

1. Step 1. Magnetic-core memory — is part of — Mainframe. Magnetic-core memory.
2. Step 2. Mainframe — uses — Punched card. Programs were entered on punched cards.
3. Step 3. Punched card — is made of — Paper. Punched cards are stiff card.
4. Step 4. Paper — uses — Paper machine. Industrial production.

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