Men wearing hard hats and safety vests are working.
Men are wearing safety equipment.
Men wearing hard hats and safety vests is same as Men are wearing safety equipment
exists e2 e1 s1 x1 x2 x3 x4 x5.(Actor(e2,x1) & v_work(e2) & subset_of(x4,x1) & n_vest(x4) & of(x4,x5) & n_safety(x5) & subset_of(x2,x1) & n_hat(x2) & a_hard(s1) & Theme(s1,x2) & Actor(e1,x2) & v_wear(e1) & of(x2,x3) & n_man(x3))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_equipment(x2) & of(x2,x3) & n_safety(x3) & n_man(x1))