Workers in green shirts are waiting on several customers.
None of the customers are wearing hats.
Waiting on customers does not imply none of the customers are wearing hats.
exists e1 s1 s2 x1 x2 x3.(on(e1,x3) & n_customer(x3) & a_several(s2) & Theme(s2,x3) & Actor(e1,x1) & v_wait(e1) & in(x1,x2) & n_shirt(x2) & a_green(s1) & Theme(s1,x2) & n_worker(x1))
exists e1 x1 x2 x3.(n_customer(x2) & Theme(e1,x3) & Actor(e1,x1) & v_wear(e1) & n_hat(x3) & of(x1,x2) & n_none(x1))