premise: A girl is standing and another one is sitting by a tree
hypothesis: There are two girls.
explanation_1: A girl and another one are two girls.
explanation_2: A girl standing and another one meaning another girl sitting makes two girls.
explanation_3: If one girl is standing and the another is sitting, there are two.
premise_logic: exists e2 e1 x1 x2 x3.(by(e2,x3) & n_tree(x3) & Actor(e2,x2) & v_sit(e2) & n_thing(x2) & card_eq_1(x2) & -(x2 = x1) & n_thing(x1) & card_eq_1(x1) & Actor(e1,x1) & v_stand(e1) & n_girl(x1))
hypothesis_logic: exists p1 x1 x2.((x1 = x2) & n_girl(x2) & card_eq_2(x2))