A crowded day with many skiers and snowboarders on the slopes.
It was a sunny day while the skiers and snowboarders were on the slopes.
We can't see that it is sunny; it could be a glare.
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 p1 p2 x1 x3 x4 x5 x6.(n_slope(x6) & n_snowboarder(x5) & n_skier(x4) & subset_of(x5,x3) & subset_of(x4,x3) & n_thing(x1) & exists p3.on(x3,x6) & while(p1,p2) & exists s1 x2.((x1 = x2) & n_day(x2) & a_sunny(s1) & Theme(s1,x2)))