1. In spelling of 1 to 99 letters a, b, c, d are not used until 100 in which 'd' comes twice - hundred.
2. In spelling of 1 to 999 a,b,c are not used and a comes in 'Thousand'.
3. In spelling of 1 to 999,999,999 letters b,c are never used until in Billion where b comes for the first time.
4. Letter 'c' is never used in English counting .
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