People waiting outside a building next to a mural.
A single person sits inside of a building.
People imply more than a single person. Outside and inside are direct opposites.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & outside(e1,x3) & to(x4,x5) & n_mural(x5) & next(x3,x4) & n_thing(x4) & n_building(x3) & Actor(e1,x2) & v_wait(e1) & (x1 = x2) & n_people(x1))
exists e1 s1 s2 x1 x2.(of(e1,x2) & n_building(x2) & a_inside(s2) & Manner(e1,s2) & Actor(e1,x1) & v_sit(e1) & n_person(x1) & a_single(s1) & Theme(s1,x1))