A group of young African American kids sitting on a white wall in front of a white building.
A group of kids are hanging out outside in a city.
Sitting is not the same as hanging out.  Not every wall is outside.  Buildings may exist outside of a city.
exists e1 s1 s2 s3 s4 s5 x1 x2 x3 x4 x5 x6.(a_topic(x1) & of(x1,x2) & in(e1,x5) & of(x5,x6) & n_building(x6) & a_white(s5) & Theme(s5,x6) & n_front(x5) & on(e1,x4) & n_wall(x4) & a_white(s4) & Theme(s4,x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_kid(x2) & a_american(s3) & Theme(s3,x2) & a_african(s2) & Theme(s2,x2) & a_young(s1) & Theme(s1,x2) & n_group(x1))
exists e1 s1 x1 x2 x3.(in(e1,x3) & n_city(x3) & r_outside(e1) & a_out(s1) & Manner(e1,s1) & Actor(e1,x1) & v_hang(e1) & of(x1,x2) & n_kid(x2) & n_group(x1))