The letters in the word are E-X-T-R-A. The pair is A and E. There are three letters between them in the alphabet (B,C,D). In the word, there are three letters between them (R,T,X). When A and E are alphabetized, E comes second. [cite: 5178, 5179, 5180, 5181, 5182, 5183, 5184, 5185, 5188, 5190]