Compiler and sonar: what they have in common

1. Step 1. Compiler — is used in — Programming language. Code is translated by a compiler.
2. Step 2. Programming language — includes — BASIC. A language.
3. Step 3. BASIC — is used in — Personal computer. The first PCs came with BASIC.
4. Step 4. Personal computer — has part — Monitor. A monitor.
5. Step 5. Monitor — is part of — Ultrasound scanner. A screen.
6. Step 6. Ultrasound scanner — works like — Sonar. A medical sonar: the same echo principle.

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