Man cleans roller coaster.
Cleaning roller coaster
The man always cleans the roller coaster.
exists e1 x1 x2 x3.(ne_nam_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_clean(e1) & n_coaster(x2) & of(x2,x3) & n_roller(x3))
exists e1 x1 x2.(n_coaster(x1) & of(x1,x2) & n_roller(x2) & Actor(e1,x1) & v_clean(e1) & a_topic(x1))