A crowded day with many skiers and snowboarders on the slopes.
The skiers and snowboarders are falling down.
Skiers and snowboarders can be on the slopes without falling down.
exists s1 x1 x2 x3 x4 x5.(n_slope(x5) & a_topic(x1) & on(x1,x5) & with(x1,x2) & n_snowboarder(x4) & n_skier(x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_quantity(x2) & n_day(x1) & a_crowded(s1) & Theme(s1,x1))
exists e1 p1 x1 x2 x3.(n_snowboarder(x3) & n_skier(x2) & subset_of(x3,x1) & subset_of(x2,x1) & exists s1.(Theme(s1,x1) & a_down(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_fall(e1))