A man teaches a small class.
The woman is teaching a large group.
A man is never a woman and a small class cannot be consisting of a large group.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_teach(e1) & n_class(x2) & a_small(s1) & Theme(s1,x2) & n_man(x1))
exists e1 s1 x1 x2.(n_woman(x1) & Theme(e1,x2) & Actor(e1,x1) & v_teach(e1) & n_group(x2) & a_large(s1) & Theme(s1,x2))