In all other groups, the first, second and third letters are respectively moved one, two and three steps forward to give the second, third and fourth letters respectively.
In all other groups, the first and second as well as the third and fourth letters are consecutive and the third letter is nine steps ahead of the second.
In all other groups, the second, third and fourth letters are respectively three, five and seven steps ahead of the first, second and third letters respectively.
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