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 4 th 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’). BLFT = (B = 2, L = 12, F = 6), so (2 + 12 + 6) = 20, so ‘20’ is the positional value of ‘T’). EGHV = (E = 5, G = 7, H = 8, so (5 + 7 + 8) = 20, so ‘20’ is the positional value of ‘T’).