Study the following arrangement carefully and answer the questions given below:
B U B D C E D B D E U B A D C B E A C D A E B A U A C D B C A C
How many such pairs of alphabets are there in the series of alphabets given in BOLD (A to E) in the above arrangement each of which has as many letters between them (in both forward and backward directions) as they have between them in the English alphabetical series?
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