A group of people are outside a brick building.
the people were on concrete
There can be no concrete outside a building.
exists p1 x1 x2.(exists x3 x4.(outside(x1,x3) & n_building(x3) & of(x3,x4) & n_brick(x4)) & of(x1,x2) & n_people(x2) & n_group(x1))
exists p1 x1.(n_people(x1) & exists x2.(on(x1,x2) & n_concrete(x2)))