An ET lifeform, Ozabidinus has a triplet genetic code just like organisms on earth, but w/5 bases A,C,G,T,B.?

A-adenine C-cytosine G-guanine T-thymine, and B-bozomine...How many different codons can this genetic code specify? How did u get to this answer? What did u do to get this answer? And another ques. Give the sequence of the start and stop codons.