construction workers do maintenance on a train station stop.
Firemen do maintenance on a train station stop.
construction workers and  Firemen  do maintenance on a train station stop.
exists e1 x1 x2 x3 x4 x5 x6.(on(e1,x4) & n_stop(x4) & of(x4,x6) & n_station(x6) & of(x4,x5) & n_train(x5) & Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_maintenance(x3) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 x1 x2 x3 x4 x5.(on(e1,x3) & n_stop(x3) & of(x3,x5) & n_station(x5) & of(x3,x4) & n_train(x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_maintenance(x2) & n_fireman(x1))