Men wearing hard hats and safety vests are working.
The group of men is wearing protection gear
Men wearing hard hats and safety vests is same as group of men is wearing protection gear
exists e1 e2 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 x4.(n_group(x1) & Theme(e1,x3) & Actor(e1,x1) & v_wear(e1) & n_gear(x3) & of(x3,x4) & n_protection(x4) & of(x1,x2) & n_man(x2))