People riding escalators.
People eat watermelon.
The people are either riding escalators or eating watermelon
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_escalator(x3) & (x1 = x2) & n_people(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_watermelon(x2) & n_people(x1))