Explanation
The logic followed by the letter-clusters is based on the numerical positions of the letters in the English alphabet. In the clusters HJNT, PRVB, and MOSY, the difference between consecutive letters follows a specific pattern of +2, +4, and +6. For example, in HJNT, the positions are 8, 10, 14, and 20, where 10 - 8 = 2, 14 - 10 = 4, and 20 - 14 = 6. Similarly, for PRVB, the positions are 16, 18, 22, and 28 (B is 26 + 2), and for MOSY, they are 13, 15, 19, and 25.
In contrast, the letter-cluster SUXZ uses the positions S(19), U(21), X(24), and Z(26). The differences between these letters are 21 - 19 = 2, 24 - 21 = 3, and 26 - 24 = 2. Because the sequence of increments in SUXZ is +2, +3, +2 instead of the +2, +4, +6 pattern seen in the others, it is the odd cluster.