This question is based on the following words/letter clusters.
(left) ADS DUG AGS BEG (right)

How many letters are there between the second letter of the second word/letter cluster from the right and the second letter of the second word/letter cluster from the left, counted in the English alphabetical order?

The correct answer is 13.

Let us break down the steps to find the number of letters between the two specific letters in English alphabetical order.

Step 1: Identify the given sequence of words/letter clusters.
The given sequence from left to right is:
(left) ADS DUG AGS BEG (right)

Step 2: Find the "second word/letter cluster from the right".
Moving from right to left:
- The first cluster from the right is BEG.
- The second cluster from the right is AGS.
The second letter of this cluster (AGS) is G.

Step 3: Find the "second word/letter cluster from the left".
Moving from left to right:
- The first cluster from the left is ADS.
- The second cluster from the left is DUG.
The second letter of this cluster (DUG) is U.

Step 4: Count the number of letters between G and U in English alphabetical order.
The English alphabet is: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z.
The letters lying strictly between G and U are:
H, I, J, K, L, M, N, O, P, Q, R, S, T

Counting these letters: H(1), I(2), J(3), K(4), L(5), M(6), N(7), O(8), P(9), Q(10), R(11), S(12), T(13).
There are exactly 13 letters between G and U.