Clear polycarbonate disc and computer: what they have in common

1. Step 1. Clear polycarbonate disc — is part of — DVD. Two halves glued together with tracks.
2. Step 2. DVD — evolved from — Video recorder. A replacement for video cassettes.
3. Step 3. Video recorder — has part — Magnetic tape. Video tape.
4. Step 4. Magnetic tape — is part of — UNIVAC I. Tape drives.
5. Step 5. UNIVAC I — is a kind of — Computer. A computer.

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