A father and daughter throwing rocks into the stream.
The father and daughter are riding a roller-coaster.
The father and daughter can't be throwing rocks into the stream and riding a roller coaster at the same time.
exists e1 s1 x1 x2 x3 x4 x5.(n_stream(x5) & a_topic(s1) & subset_of(x2,s1) & into(e1,x5) & Theme(e1,x4) & Actor(e1,x3) & v_throw(e1) & n_rock(x4) & (x2 = x3) & n_daughter(x2) & subset_of(x1,s1) & n_father(x1))
exists e1 x1 x2 x3 x4.(n_daughter(x3) & n_father(x2) & subset_of(x3,x1) & subset_of(x2,x1) & Theme(e1,x4) & Actor(e1,x1) & v_ride(e1) & n_roller-coaster(x4))