That's a sequence I found on Quora. The goal is to find what goes replaces the "x"s. The answer should be letters, not numbers.
AI, CL, DP, xx, xx
Hint: you could convert the letters into numbers
https://www.quora.com/unanswered/What-is-the-sequence-of-the-alphabetical-sequence-AI-CL-DP-xx-xx