Snowmobiler riding snowmobile with front end up in the air.
There are Snowmobiler in outdoors.
Riding snowmobile must be done outdoors.
exists s1 x1 x2 x3 x4 x5.(n_air(x5) & a_topic(x1) & n_up(x1) & in(x1,x5) & with(x1,x4) & n_end(x4) & a_front(s1) & Theme(s1,x4) & n_snowmobile(x1) & of(x1,x3) & n_riding(x3) & (x1 = x2) & ne_nam_snowmobiler(x2))
exists p1 x1 x2.(in(p1,x2) & n_outdoors(x2) & exists x3.((x1 = x3) & n_snowmobiler(x3)))