premise: Five girls and two guys are crossing a overpass.
hypothesis: There are people outside.
explanation_1: The fact that these are people is implied by "girls" and "guys".  An "overpass" is used only in context of being outside, referring to a road crossing over another road.  Roads are almost always outside, particularly for this type of interchange.
explanation_2: Five girls and two guys are people, and overpass implies outside.
explanation_3: An overpass is found outdoors.
premise_logic: exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_cross(e1) & n_overpass(x4) & subset_of(x3,x1) & n_guy(x3) & card_eq_2(x3) & subset_of(x2,x1) & n_girl(x2) & card_eq_5(x2))
hypothesis_logic: exists p1 s1 x1.(a_outside(s1) & Manner(p1,s1) & exists x2.((x1 = x2) & n_people(x2)))
premise_sim: exists e1 x1 x2 x3 x4.(v_cross(e1) & subset_of(x3,x1) & subset_of(x2,x1) & n_overpass(x4) & n_guy(x3) & n_girl(x2) & card_eq_5(x2) & card_eq_2(x3) & Theme(e1,x4) & Actor(e1,x1))
hypothesis_sim: exists p1 s1 x1.(exists x2.(n_people(x2) & (x1 = x2)) & a_outside(s1) & Manner(p1,s1))