A man and a woman on stage performing a dance.
A man and a woman on stage performing a tango.
Just because a man and woman are performing a dance it doesn't mean they are performing a tango.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(s1) & subset_of(x2,s1) & Theme(e1,x5) & Actor(e1,x4) & v_perform(e1) & n_dance(x5) & (x2 = x4) & on(x2,x3) & n_stage(x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(s1) & subset_of(x2,s1) & Theme(e1,x5) & Actor(e1,x4) & v_perform(e1) & n_tango(x5) & (x2 = x4) & on(x2,x3) & n_stage(x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))