Skiiers at the top of a snow covered hill.
Skiiers stop at the top of the hill.
top of a snow covered hill is inferred as  top of the hill.
exists e1 x1 x2 x3 x4.(n_top(x2) & a_topic(x1) & at(x1,x2) & of(x2,x3) & n_hill(x3) & Theme(e1,x3) & v_cover(e1) & of(x3,x4) & n_snow(x4) & n_skiier(x1))
exists e1 x1 x2 x3 x4.(n_hill(x4) & n_top(x3) & at(e1,x3) & of(x3,x4) & Theme(e1,x2) & Actor(e1,x1) & v_stop(e1) & n_thing(x2) & n_skiier(x1))