A group of kids in a yard.
A group of kids are in the pool
Yard isn't the same as a pool.
exists x1 x2 x3.(a_topic(x1) & of(x1,x2) & in(x2,x3) & n_yard(x3) & n_kid(x2) & n_group(x1))
exists p1 x1 x2 x3.(n_pool(x3) & in(x1,x3) & of(x1,x2) & n_kid(x2) & n_group(x1))