A group is looking at things for sale.
A group of people read the newspapers in the park.
One can't be looking for things for sale and read the newspaper at the same time.
exists e1 x1 x2 x3.(at(e1,x2) & for(x2,x3) & n_sale(x3) & n_thing(x2) & Actor(e1,x1) & v_look(e1) & n_group(x1))
exists e1 x1 x2 x3 x4.(n_park(x4) & n_newspaper(x3) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_read(e1) & of(x1,x2) & n_people(x2) & n_group(x1))