In all other groups, the first two letters are alternate, third and fourth letters are consecutive and there is a gap of four letters between the second and third letters.
In all other groups, there is a gap of one letter between first and second letters, two letters between second and third and three letters between third and fourth.
In all other groups, the first and second as well as the third and fourth letters are alternate, and the third letter is three steps ahead of the second letter.
In all other groups, the first and second letters are alternate; the third and fourth letters are alternate and written in a reverse alphabetical order.
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