Letter D comes for the first time in Hundred
Letters A, B and C do not appear anywhere in the spellings of 1 to 999
Letter A comes for the first time in Thousand
Letters B and C do not appear anywhere in the spellings of 1 to 999,999,999
Letter B comes for the first time in Billion
AndLetter C does not appear anywhere in in the spellings of entire English Counting
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