A man in an orange vest works on fixing a train.
A man who is a train mechanic works outside.
Not all men in orange vests are a train mechanic.
exists e1 e2 x1 x2 x3 x4 x5.(on(e1,e2) & Theme(e2,x5) & Actor(e2,x4) & v_fix(e2) & n_train(x5) & Actor(e1,x1) & v_work(e1) & in(x1,x2) & n_vest(x2) & of(x2,x3) & n_orange(x3) & n_man(x1))
exists p1 s1 x1 x2.(a_topic(x1) & a_outside(s1) & Manner(p1,s1) & exists s2 x3 x4.((x2 = x3) & n_work(x3) & a_mechanic(s2) & Theme(s2,x3) & of(x3,x4) & n_train(x4)) & (x1 = x2) & n_man(x1))