C and conveyor belt: what they have in common

1. Step 1. C — is used in — Unix. Unix was rewritten in C.
2. Step 2. Unix — is a kind of — Operating system. An operating system.
3. Step 3. Operating system — has part — File system. A file system.
4. Step 4. File system — uses — Hard disk drive. Partitioning the disk.
5. Step 5. Hard disk drive — has part — Ball bearing. Bearings (later fluid-dynamic ones).
6. Step 6. Ball bearing — is part of — Conveyor belt. The rollers turn on bearings.

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