In the word “ EXPLAIN”, how many pairs of letters are there where the number of letters between them in the word is the same as the number of letters between them in the English alphabetical series, both when moving forward and backward in the alphabet?

In the word ‘MONETARY’, how many pairs of the letters have the same number of letters between them (both forward and backward direction) as in the English alphabet?

In the word "ANALYST", how many pairs of the letters have the same number of letters between them (only in backward direction) as in the English alphabet?