Let's analyze the pattern for each letter position in the series:
1st letters: K (11), J (10), H (8), E (5), ?
Observe the pattern in numeric order: 11 → 10 (–1), 10 → 8 (–2), 8 → 5 (–3)
Next decrement should be –4: 5 – 4 = 1, which corresponds to A.
2nd letters: Q (17), T (20), X (24), C (3), ?
Look at the numeric pattern: 17 → 20 (+3), 20 → 24 (+4), 24 → 3 (wrap around; 24 + 5 = 29 → 29 – 26 = 3)
Next increment is +6: 3 + 6 = 9 → I.
3rd letters: G (7), K (11), O (15), S (19), ?
Sequence is +4 each time: 7 → 11 (+4), 11 → 15 (+4), 15 → 19 (+4)
Next will be 19 + 4 = 23 → W.
Thus, the next cluster is A I W.