How many such pairs of letters are there in t | vedclass

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(B) To find the pairs of letters in the word $STRIVE$ that have the same number of letters between them as in the English alphabet,we check both forwa

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Two

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(B) To find the pairs of letters in the word $STRIVE$ that have the same number of letters between them as in the English alphabet,we check both forward and backward directions:$1$. Forward direction:- $S$ to $T$: $S, T$ ($0$ letters between them in the word,$0$ in the alphabet) - This is a pair.- $S$ to $R$: $S, T, R$ ($1$ letter between them in the word,$0$ in the alphabet) - No.- $S$ to $I$: $S, T, R, I$ ($2$ letters between them in the word,$9$ in the alphabet) - No.- $S$ to $V$: $S, T, R, I, V$ ($3$ letters between them in the word,$2$ in the alphabet) - No.- $S$ to $E$: $S, T, R, I, V, E$ ($4$ letters between them in the word,$13$ in the alphabet) - No.- $T$ to $R$: $T, R$ ($0$ letters between them in the word,$0$ in the alphabet) - This is a pair.- $T$ to $I$: $T, R, I$ ($1$ letter between them in the word,$10$ in the alphabet) - No.- $R$ to $I$: $R, I$ ($0$ letters between them in the word,$8$ in the alphabet) - No.- $I$ to $V$: $I, V$ ($0$ letters between them in the word,$12$ in the alphabet) - No.- $V$ to $E$: $V, E$ ($0$ letters between them in the word,$16$ in the alphabet) - No.$2$. Backward direction:- $E$ to $V$: $E, V$ ($0$ letters between them in the word,$16$ in the alphabet) - No.- $E$ to $I$: $E, V, I$ ($1$ letter between them in the word,$12$ in the alphabet) - No.- $E$ to $R$: $E, V, I, R$ ($2$ letters between them in the word,$8$ in the alphabet) - No.- $E$ to $T$: $E, V, I, R, T$ ($3$ letters between them in the word,$1$ in the alphabet) - No.- $E$ to $S$: $E, V, I, R, T, S$ ($4$ letters between them in the word,$13$ in the alphabet) - No.- $V$ to $I$: $V, I$ ($0$ letters between them in the word,$12$ in the alphabet) - No.- $I$ to $R$: $I, R$ ($0$ letters between them in the word,$8$ in the alphabet) - No.- $R$ to $T$: $R, T$ ($0$ letters between them in the word,$0$ in the alphabet) - This is a pair.- $T$ to $S$: $T, S$ ($0$ letters between them in the word,$0$ in the alphabet) - This is a pair.The pairs are $(S, T), (T, R), (R, T), (T, S)$. However,looking at the sequence $STRIVE$,the pairs are $(S, T)$ and $(T, R)$. Thus,there are $2$ such pairs.

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

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