premise: Stretching before roller derby.
hypothesis: Some people are stretching before a competition.
explanation_1: Having a roller derby does not always imply a competition.
explanation_2: Stretching before a roller derby does not tell me that it is some people who are stretching.
explanation_3: Roller derby does not mean it is a competition.
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 x1 x2.(before(e1,x2) & n_competition(x2) & Actor(e1,x1) & v_stretch(e1) & n_people(x1))