a snowboarder gets air off a jump.
the snowboarder does a front flip off the jump
Getting air does not imply does a front flip
exists e1 x1 x2 x3.(off(e1,x3) & n_jump(x3) & Theme(e1,x2) & Actor(e1,x1) & v_get(e1) & n_air(x2) & n_snowboarder(x1))
exists e1 x1 x2 x3 x4.(n_jump(x4) & n_snowboarder(x1) & off(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_flip(x2) & of(x2,x3) & n_front(x3))