premise: girl wearing swim gear is surfboarding
hypothesis: Two men are on a sailboat.
explanation_1: One girl who is surfboarding is not the same as two men who are on a sailboat because they are different in number, gender and activities.
premise_logic: exists e2 e1 x1 x2 x3.(Actor(e2,x1) & v_surfboard(e2) & n_gear(x1) & of(x1,x3) & n_swim(x3) & Actor(e1,x1) & v_wear(e1) & of(x1,x2) & n_girl(x2))
hypothesis_logic: exists p1 x1.(exists x2.(on(x1,x2) & n_sailboat(x2)) & n_man(x1) & card_eq_2(x1))
premise_sim: exists e2 e1 x1 x2 x3.(v_wear(e1) & v_surfboard(e2) & of(x1,x3) & of(x1,x2) & n_swim(x3) & n_girl(x2) & n_gear(x1) & Actor(e2,x1) & Actor(e1,x1))
hypothesis_sim: exists x1.(n_man(x1) & exists x2.(on(x1,x2) & n_sailboat(x2)) & card_eq_2(x1))