Letters A, B, C and D do not appear anywhere in the spellings of 1 to 99.
Letter D comes for the first time in 100 (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 1000 (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 1,000,000,000 (Billion)
And.....
Letter C does not appear anywhere in the spellings of entire English Counting.
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