premise: A group of girls climb up a snowy hill.
hypothesis: A group of boys climb up a snowy hill.
explanation_1: Sentence one states a group of girls versus sentence 2 a group of boys.  It could only be girls or it could only be boys or it may be both girls and boys together climbing up a snowy hill.  From the two sentences we we can dispute if they were girls, boys, or both.
premise_logic: exists e1 s1 s2 x1 x2 x3.(a_up(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x1) & v_climb(e1) & n_hill(x3) & a_snowy(s1) & Theme(s1,x3) & of(x1,x2) & n_girl(x2) & n_group(x1))
hypothesis_logic: exists e1 s1 s2 x1 x2 x3.(a_up(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x1) & v_climb(e1) & n_hill(x3) & a_snowy(s1) & Theme(s1,x3) & of(x1,x2) & n_boy(x2) & n_group(x1))
premise_sim: exists e1 s1 s2 x1 x2 x3.(v_climb(e1) & of(x1,x2) & n_hill(x3) & n_group(x1) & n_girl(x2) & a_up(s2) & a_snowy(s1) & Theme(s1,x3) & Theme(e1,x3) & Manner(e1,s2) & Actor(e1,x1))
hypothesis_sim: exists e1 s1 s2 x1 x2 x3.(v_climb(e1) & of(x1,x2) & n_hill(x3) & n_group(x1) & n_boy(x2) & a_up(s2) & a_snowy(s1) & Theme(s1,x3) & Theme(e1,x3) & Manner(e1,s2) & Actor(e1,x1))