Four of the following five are alike in a certain way and hence form a group. Find the one that doesn’t belong to that group. 

Study the following information carefully and answer the questions given below. Ten boxes viz. D, E, F, G, H, I, J, K, L and M were placed one above the other in two different stacks viz. Stack Y and Stack Z, but not necessarily in the same order. Stack Y is to the west of Stack Z. Box G was placed three boxes above box H which is neither placed at stack Z nor in the same stack as box G. Box I was placed two boxes above box H in the same stack. Equal number of boxes was placed above and below box M which is placed at stack Z. Box F was placed below Box M but not in the same stack. Box D was placed two boxes above box F and immediately below box L, which is placed to the west of box J. Box K was not placed at the bottommost position.