A man and a woman are preparing to drop a white ball into a tube.
Two men are preparing to drop a red ball into a tube.
The pair are either two men, or a man and a woman. They are dropping either a red ball or a white ball.
exists e1 p1 x1 x2 x3.(Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2 s1 x4 x5.(into(e2,x5) & n_tube(x5) & Theme(e2,x4) & Actor(e2,x1) & v_drop(e2) & n_ball(x4) & a_white(s1) & Theme(s1,x4)) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2 s1 x2 x3.(into(e2,x3) & n_tube(x3) & Theme(e2,x2) & Actor(e2,x1) & v_drop(e2) & n_ball(x2) & a_red(s1) & Theme(s1,x2)) & n_man(x1) & card_eq_2(x1))