A boy at the end of a slip and slide.
A boy is sitting on the couch.
Person on a couch can not be slip and slide at the same time.
exists x1 x2 x3 x4 x5.(n_end(x2) & a_topic(x1) & at(x1,x2) & of(x2,x3) & n_slide(x5) & n_slip(x4) & subset_of(x5,x3) & subset_of(x4,x3) & n_boy(x1))
exists e1 x1 x2.(n_couch(x2) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1))