Various people walking through a building of some kind.
a tour group is touring the building
Various people does not necessary imply they are a tour group.  Just because the people are walking through the building it does not mean that they are touring the building.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & through(e1,x3) & of(x3,x4) & n_kind(x4) & n_building(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1) & a_various(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_building(x3) & Theme(e1,x3) & Actor(e1,x1) & v_tour(e1) & n_group(x1) & of(x1,x2) & n_tour(x2))