I did not know this fact about English numbers and A B C D

Did You Know this before? I did not at all..

Letters '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.