premise: A couple of friends have a drink.
hypothesis: Two women are swimming underwater.
explanation_1: If swimming underwater, one cannot have a drink.
explanation_2: The people can either have a drink together or be swimming underwater but not both at the same time.
explanation_3: have a drink  is different from swimming.
premise_logic: exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & n_drink(x3) & of(x1,x2) & n_friend(x2) & n_couple(x1))
hypothesis_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_swim(e1) & n_underwater(x2) & n_woman(x1) & card_eq_2(x1))