Antivirus and fitness tracker: what they have in common

1. Step 1. Antivirus — uses — Computer virus. It fights viruses.
2. Step 2. Computer virus — is a kind of — Software. A program.
3. Step 3. Software — includes — Mobile app. Software.
4. Step 4. Mobile app — uses — Smartphone. For a smartphone.
5. Step 5. Smartphone — has part — Accelerometer. The accelerometer rotates the screen.
6. Step 6. Accelerometer — is part of — Fitness tracker. A pedometer.

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