Optical character recognition (OCR) and aerosol can: what they have in common

1. Step 1. Optical character recognition (OCR) — is a kind of — Algorithm. OCR is an algorithm that turns a picture of letters into text.
2. Step 2. Algorithm — is used in — Program control of a machine. A program is a written algorithm.
3. Step 3. Program control of a machine — is used in — Player piano. The tune is recorded on a perforated roll.
4. Step 4. Player piano — has part — Bellows. Pedal bellows create suction.
5. Step 5. Bellows — has part — Valve. A valve in the bellows lets air in when they open and keeps it from escaping back.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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