A man and a woman eating a meal together.
A couple share a meal.
man and a woman doesn't imply couple
exists e1 s1 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & Theme(e1,x4) & Actor(e1,x3) & v_eat(e1) & r_together(x4) & n_meal(x4) & (x2 = x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
all x1.(n_meal(x1) -> exists x2 x3.(a_topic(x2) & for(x2,x1) & n_share(x2) & of(x2,x3) & n_couple(x3)))