A snowboarder grinds a wooden box over a melted patch of snow.
skier grinds a box
skier and snowboarder are different kind of athletes
exists e1 s1 s2 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_grind(e1) & over(x2,x3) & of(x3,x4) & n_snow(x4) & n_patch(x3) & a_melted(s2) & Theme(s2,x3) & n_box(x2) & a_wooden(s1) & Theme(s1,x2) & n_snowboarder(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_grind(e1) & n_box(x2) & n_skier(x1))