Four of the following five are alike in a certain way based on a group, which among the following does not belong to that group?

The pattern followed here is: The sum of positional value of 1st, 2nd and 3rd letter from the left end is the positional value of 4th letter in the English Alphabetical order. CDEL = (C = 3, D = 4, E = 5, so (3 + 4 + 5) = 12, ‘12’ is the positional value of ‘L’). BCDI = (B = 2, C = 3, D = 4, so (2 + 3 + 4) = 9, ‘9’ is the positional value of ‘I’). GHIX = (G = 7, H = 8, I = 9), so (7 + 8 + 9) = 24, ‘24’ is the positional value of ‘X’). GHCR = (G = 7, H = 8, C = 3), so (7 + 8 + 3) = 18, so ‘18’ is the positional value of ‘RR’). GFJX = (G = 7, F = 6, J = 10, so (7 + 6 + 10) = 23, so ‘23’ is the positional value of ‘W’).