Letter's 'a', 'b', 'c' & 'd' do not appear anywhere in the spellings of 1 to 99.
(Letter 'd' comes for the first time in Hundred).
Letters 'a', 'b' & 'c' do not appear anywhere in the spellings of 1 to 999.
(Letter 'a' comes for the first time in Thousand).
Letters 'b' & 'c' do not appear anywhere in the spellings of 1 to 999,999,999.
(Letter 'b' comes for the first time in Billion).
And Letter 'c' does not appear anywhere in the spellings of entire English Counting.
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