Password and smartphone: what they have in common

1. Step 1. Password — evolved from — Time-sharing. They appeared in CTSS to separate users.
2. Step 2. Time-sharing — uses — Mainframe. Multi-user mainframes.
3. Step 3. Mainframe — has part — Magnetic-core memory. Magnetic-core memory.
4. Step 4. Magnetic-core memory — evolved into — RAM. DRAM displaced core memory.
5. Step 5. RAM — is part of — Smartphone. RAM.

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