premise: Stretching before roller derby.
hypothesis: A woman is stretching by doing the splits.
explanation_1: There are many different ways to stretch aside from doing the splits.
explanation_2: Stretching comes in many ways, so she could have been doing other types of stretching instead of doing the splits.
explanation_3: There could be a man or a woman stretching.
premise_logic: exists e1 x1 x2 x3.(before(e1,x2) & n_derby(x2) & of(x2,x3) & n_roller(x3) & Actor(e1,x1) & v_stretch(e1) & n_thing(x1))
hypothesis_logic: exists e1 e2 x1 x2.(n_splits(x2) & by(e1,e2) & Theme(e2,x2) & Actor(e2,x1) & v_do(e2) & Actor(e1,x1) & v_stretch(e1) & n_woman(x1))