1st letters of each term are : C, E, G, ?, K
We can observe that these are alternate alphabets of english alphabets
Hence, we can say that the first alphabet of the missing term will be I
2nd letter of each term are : A, E, I, ?, U
We can observe that there is gap of exactly 3 alphabets between any 2 consecutive terms.
Hence we can say that the second alphabet of the missing term will be O
3rd letter of each term are :T, R, P, ?, L
We can observe that these are alternate alphabets in descending order.
Hence we can say that the third alphabet of the missing term will be N
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