Some people waiting to purchase items from a street vendor.
A couple browses an electronics aisle.
A street vendor doesn't have an electronics aisle.
exists e1 p1 x1 x2.(a_topic(x1) & Topic(e1,p1) & Actor(e1,x2) & v_wait(e1) & exists e2 x3 x4 x5.(from(e2,x4) & n_vendor(x4) & of(x4,x5) & n_street(x5) & Theme(e2,x3) & Actor(e2,x2) & v_purchase(e2) & n_item(x3)) & (x1 = x2) & n_people(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_browse(e1) & n_aisle(x2) & of(x2,x3) & n_electronics(x3) & n_couple(x1))