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isn

0.  is 
1. a - isna
2. b - isnb
3. c - isnc
4. d - isnd
5. e - isne
6. f - isnf
7. g - isng
8. h - isnh
9. i - isni
10. j - isnj
11. k - isnk
12. l - isnl
13. m - isnm
14. n - isnn
15. o - isno
16. p - isnp
17. q - isnq
18. r - isnr
19. s - isns
20. t - isnt
21. u - isnu
22. v - isnv
23. w - isnw
24. x - isnx
25. y - isny
26. z - isnz