Virtual key,Physical key
1. lan,lan
2. local area network,lan
3. internet,lan
4. intranet ,lan
5. internet,internet
6. network ,internet
7. operating system,operating_system
8. os,operating_system
9. dos,operating_system
10. windows,operating_system
11. unix,operating_system
12. linux ,operating_system

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End of processing