A man in a hard hat and safety vest operates a jackhammer.
A man operates a forklift.
Jackhammer is a different piece of equipment from forklift
exists e1 s1 x1 x2 x3 x4 x5 x6.(Theme(e1,x6) & Actor(e1,x1) & v_operate(e1) & n_jackhammer(x6) & in(x1,x2) & n_vest(x4) & of(x4,x5) & n_safety(x5) & n_hat(x3) & a_hard(s1) & Theme(s1,x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_operate(e1) & n_forklift(x2) & n_man(x1))