Dogs are pulling a sled across the snow.
Dogs are pulling a sled across the snow in a sledding competition.
Pulling a sled across the snow does not imply it is a sledding competition.
exists e1 x1 x2 x3.(n_snow(x3) & across(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_pull(e1) & n_sled(x2) & n_dog(x1))
exists e1 s1 x1 x2 x3 x4.(n_snow(x3) & Theme(e1,x2) & Actor(e1,x1) & v_pull(e1) & in(x2,x4) & n_competition(x4) & a_sledding(s1) & Theme(s1,x4) & across(x2,x3) & n_sled(x2) & n_dog(x1))