27^27
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There are 8*7/(2*1) = 28 combinations.
There are 3 consonants from 21 and 2 vowels from 5. That gives 21C3 * 5C2 combinations = 21*20*19/(3*2*1) *5*4/(2*1) = 1330*10 = 13300 combinations in all.
There are 2*2*5 = 20 combinations.
Two make combinations you would take 2x1=2 combinations only
There are 11C2 = 11*10/(2*1) = 55 combinations.