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How many such pairs of letters are there in the word INSTRUCTION which have as many letters between them in the word as in the English alphabet?
Between S and T in the word, there are 0 letters, and similarly, in the English alphabet, there are none in between.
Between I and C in the word (NSTRU), there are 5 letters, and the same gap is there in the alphabet as well (D, E, F, G, H).
Between O and N in the word, there are 0 letters, and similarly, in the English alphabet, there are none in between.
Between N and T in the word (STRUC), there are 5 letters, and the same gap is there in the alphabet as well (O, P, Q, R, S).
Thus, we have 4 such pairs.