Explanation
The series follows a consistent pattern based on the numerical positions of the letters in the English alphabet where A=1, B=2, and so on up to Z=26. Each subsequent term is generated by adding 10 to the positional value of the corresponding letters in the previous term, using a cyclic shift where values exceeding 26 wrap around to the beginning of the alphabet (Pₙ = (Pₙ₋₁ + 10) 26).
For the first letter of each term, the sequence is A(1), K(11), U(21), and E(5) because 21 + 10 = 31, and 31 - 26 = 5. Adding 10 to E(5) gives 15, which corresponds to the letter O.
For the second letter, the sequence is W(23), G(7) because 23 + 10 = 33 and 33 - 26 = 7, Q(17), and A(1) because 17 + 10 = 27 and 27 - 26 = 1. Adding 10 to A(1) gives 11, which corresponds to the letter K.
For the third letter, the sequence is S(19), C(3) because 19 + 10 = 29 and 29 - 26 = 3, M(13), and W(23). Adding 10 to W(23) gives 33, and 33 - 26 = 7, which corresponds to the letter G.
For the fourth letter, the sequence is O(15), Y(25), I(9) because 25 + 10 = 35 and 35 - 26 = 9, and S(19). Adding 10 to S(19) gives 29, and 29 - 26 = 3, which corresponds to the letter C.
Combining these letters results in the term OKGC. Additionally, within every four-letter group in this series, each letter decreases by a fixed value of 4 (15-4=11, 11-4=7, 7-4=3), confirming the internal logic of the sequence.