A group of people are walking close to some trees.
A group of birdwatchers walks in the forest.
You can not infer there are birdwatchers.
exists e1 x1 x2 x3.(to(e1,x3) & n_tree(x3) & r_close(e1) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3.(n_forest(x3) & in(e1,x3) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_birdwatcher(x2) & n_group(x1))