premise: A group of girls ride an ATV.
hypothesis: Girls ride ATVs.
explanation_1: If one group of girls ride an ATV, girls must ride ATVS.
explanation_2: "Girls ride ATVs" ia a rephrasing of "a group of girls ride an ATV"
explanation_3: Girls can be in groups.
premise_logic: exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & ne_nam_atv(x3) & of(x1,x2) & n_girl(x2) & n_group(x1))
hypothesis_logic: exists s1 x1 x2 x3.(n_atv(x1) & a_.(s1) & Theme(s1,x1) & of(x1,x3) & n_ride(x3) & (x1 = x2) & ne_nam_girls(x2) & a_topic(x1))