C and hammer: what they have in common

1. Step 1. C — is used in — Unix. Unix was rewritten in C.
2. Step 2. Unix — uses — Command line. The shell.
3. Step 3. Command line — evolved from — Typewriter. The teletype was a printing terminal.
4. Step 4. Typewriter — has part — Lever. Each key is a system of levers.
5. Step 5. Lever — is used in — Hammer. The handle lengthens the arm of the blow.

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