SSC CHSL 6 Mar 2018 Shift 1 Paper

Series : CAL, AWF, YSZ, WOT, ?
The pattern followed in each letter of the terms is :
1st letter : C (-2 letters) = A (-2 letters) = Y (-2 letters) = W (-2 letters) = U
2nd letter : A (-4 letters) = W (-4 letters) = S (-4 letters) = O (-4 letters) = K
3rd letter : L (-6 letters) = F (-6 letters) = Z (-6 letters) = T (-6 letters) = N
Thus, missing term = UKN