In all other groups, the third and first letters are alternate letters, while the first two letters are consecutive letters of the alphabet.

In all other groups, the first letter occupies the same position from A onward as the second letter occupies from Z backward e.g., D is the fourth letter from the beginning and W is the fourth letter from the end of the alphabet.

This is the only group containing two vowels.

In all other groups contain two alternate letters in reverse order.