A baby sitting on a rug reaching for a guitar.
A baby with a piano.
One cannot be with a piano and be reaching for a guitar.
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & for(e1,e2) & for(e2,x4) & n_guitar(x4) & Actor(e2,x2) & v_reach(e2) & on(e1,x3) & n_rug(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_baby(x1))
exists x1 x2.(a_topic(x1) & with(x1,x2) & n_piano(x2) & n_baby(x1))