A large group of people crosscountry skiing in the snow.
Snowboarders in a group on the snow.
The snowboarders cannot be skiing while they are snowboarding.
exists s1 x1 x2 x3 x4.(n_snow(x4) & a_topic(x1) & in(x1,x4) & n_crosscountry(x1) & Time(x1,x3) & n_skiing(x3) & of(x1,x2) & n_people(x2) & n_group(x1) & a_large(s1) & Theme(s1,x1))
exists x1 x2 x3.(n_snow(x3) & a_topic(x1) & in(x1,x2) & on(x2,x3) & n_group(x2) & n_snowboarder(x1))