A group of children are walking in the sand.
A group of adults are sitting in a pool.
The are children or adults, not both. The cannot be walking and sitting at the same time or be in the sand and the pool at the same time.
exists e1 x1 x2 x3.(n_sand(x3) & in(e1,x3) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_child(x2) & n_group(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_pool(x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_adult(x2) & n_group(x1))