A snowboarder is doing a flip over a mound of snow.
A skiier is doing tricks.
Skiier is different than snowboarder.
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & over(x2,x3) & of(x3,x4) & n_snow(x4) & n_mound(x3) & n_flip(x2) & n_snowboarder(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & n_skiier(x1))