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(C) To find the pairs,we check the number of letters between each pair in the word $DOCUMENTARY$ and compare it with the English alphabet:$1$. $D$ to

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(C) To find the pairs,we check the number of letters between each pair in the word $DOCUMENTARY$ and compare it with the English alphabet:$1$. $D$ to $O$: $D(E, F, G, H, I, J, K, L, M, N)O$ ($10$ letters in word,$10$ in alphabet) - Pair found: $(D, O)$.$2$. $M$ to $R$: $M(N, O, P, Q)R$ ($4$ letters in word,$4$ in alphabet) - Pair found: $(M, R)$.$3$. $T$ to $R$: $T(S)R$ ($1$ letter in word,$1$ in alphabet) - Pair found: $(T, R)$.Wait,let's re-verify: $D$ to $O$: $D, O$ (Positions $1$ and $3$). Letters between: $C, U, M, E, N, T, A, R, Y$ ($9$ letters). Alphabet: $E, F, G, H, I, J, K, L, M, N$ ($10$ letters). No.Let's check forward and backward:$D(4) O(15) C(3) U(21) M(13) E(5) N(14) T(20) A(1) R(18) Y(25)$Pairs:- $M(13)$ and $R(18)$: Between them in word is $E, N, T, A$ ($4$ letters). In alphabet: $N, O, P, Q$ ($4$ letters). Yes.- $T(20)$ and $R(18)$: Between them in word is $A$ ($1$ letter). In alphabet: $S$ ($1$ letter). Yes.- $D(4)$ and $A(1)$: Between them in word is $O, C, U, M, E, N, T$ ($7$ letters). In alphabet: $B, C$ ($2$ letters). No.There are two pairs: $(M, R)$ and $(T, R)$.

How many such pairs of letters are there in the word $DOCUMENTARY$,each of which has as many letters between them in the word as there are between them in the English alphabet?

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