A group of men are doing a synchronized dance.
A group of woman are dancing.
It must be either men or women.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_dance(x3) & a_synchronized(s1) & Theme(s1,x3) & of(x1,x2) & n_man(x2) & n_group(x1))
exists e1 x1 x2.(Actor(e1,x1) & v_dance(e1) & of(x1,x2) & n_woman(x2) & n_group(x1))