a bmx rider launches off a quarterpipe.
The bmx rider launches off the quarterpipe for the fourth time.
It does not have to be the fourth time the bmx rider launches off.
exists e1 s1 x1 x2 x3.(a_off(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x1) & v_launch(e1) & n_quarterpipe(x3) & n_rider(x1) & of(x1,x2) & n_bmx(x2))
exists e1 s1 s2 x1 x2 x3 x4.(n_time(x4) & a_fourth(s2) & Theme(s2,x4) & n_quarterpipe(x3) & n_rider(x1) & of(x1,x2) & n_bmx(x2) & for(e1,x4) & a_off(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x1) & v_launch(e1))