What does syntax of this command mean?

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Tags

1. #other
2. #understand
3. #refers
4. #software
5. #without
6. #rules
7. #piece
8. #proper
9. #order
10. #which
11. #world
12. #computer
13. #sense
14. #syntax
15. #characters
16. #makes
17. #words
18. #sequence
19. #strung
20. #together
21. #command