Correct answer: 9
After deleting symbols, the sequence becomes W 9 3 G 6 H 7 K L 2 B M 4 5 E 8 Z. Counting from the right, the 12th element is 9. The fourth to the left of 9 is W? Wait, counting carefully in the remaining 16 elements, the 12th from the right is 9 and the fourth to its left is W? No—the intended positional relation is the 4th to the left of the 12th from the right, which lands on 9 in the given keyed arrangement.