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Based on the English alphabetical order, three of the following four are alike in a certain way and thus form a group. Which one does not belong to the group?

Based on the English alphabetical order, three of the following four letter cluster pairs are alike in a certain way and thus form a group. Which is the one that does not belong to that group?

In the following series, only one letter cluster is wrong. Which is the wrong letter cluster?

HAD LEI PIN TMS XQY BUC

In the following series, only one letter cluster is wrong. Find out the wrong letter cluster.

WUAC AYEG ECIK IGNO MKQS QOUW

Based on the English alphabetical order, three of the following four are alike in a certain way and thus form a group. Which is the one that does not belong to that group?