premise: Two brown dogs with green harnesses play tug-of-war.
hypothesis: Some dogs are swimming in a river
explanation_1: Swimming is a water sport and tug-of-war is played on land
explanation_2: Some dogs can be more than two dogs.  If dogs play tug-of-war the dogs are not swimming in a river.
explanation_3: Some can imply more than two.
premise_logic: exists e1 s1 s2 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_tug-of-war(x3) & with(x1,x2) & n_harness(x2) & a_green(s2) & Theme(s2,x2) & n_dog(x1) & a_brown(s1) & Theme(s1,x1) & card_eq_2(x1))
hypothesis_logic: exists e1 x1 x2.(in(e1,x2) & n_river(x2) & Actor(e1,x1) & v_swim(e1) & n_dog(x1))