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The pairs DE and OP are consecutive, as in the alphabet. The pair PT are separated by 3 letters, as they are by the letters QRS. The pair OT are separated by 4 letters, as they are by the letters PQRS.
Two pairs of letters are there in the word ANSWER. 1) AnswE(AbcdE) - AE 2) NsweR(NopqR) - NR
2
De, on = 2
Three pairs of letters are there. E and G, G and I & L and N are those three pairs.
7
2 xa: 2xi; 2xt; = 3 pairs in total
Castraphone is not a word!However...the answer is 4 pairs of letters...# ST (ST) # RaP (PqR) # HonE (EfgH) # ON (NO)
sixty-twelve
Two, that I found.
4
The word CREDITABLE has five pairs of letters - C-E, E-D, D-A, A-E, A-B