premise: Two person are riding their bicycles.
hypothesis: The two men are swimming.
explanation_1: Two person do not have to be men.  If people are riding bicycles they are not swimming.
premise_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x2) & of(x2,x1) & n_thing(x1) & n_person(x1) & card_eq_2(x1))
hypothesis_logic: exists e1 x1.(n_man(x1) & card_eq_2(x1) & Actor(e1,x1) & v_swim(e1))
premise_sim: exists e1 x1 x2.(v_ride(e1) & of(x2,x1) & n_thing(x1) & n_person(x1) & n_bicycle(x2) & card_eq_2(x1) & Theme(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists e1 x1.(v_swim(e1) & n_man(x1) & card_eq_2(x1) & Actor(e1,x1))