People are setting up chairs on a beach.
The people are playing in the ocean.
One cannot be setting up chairs and playing at the same time.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_beach(x3) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_set(e1) & n_chair(x2) & n_people(x1))
exists e1 x1 x2.(n_ocean(x2) & n_people(x1) & in(e1,x2) & Actor(e1,x1) & v_play(e1))