Children are playing with hula hoops in a group setting.
The children are at school.
Just because children are playing does not mean that they are at a school.
exists e1 x1 x2 x3 x4 x5.(in(e1,x4) & n_setting(x4) & of(x4,x5) & n_group(x5) & with(e1,x2) & n_hoop(x2) & of(x2,x3) & n_hula(x3) & Actor(e1,x1) & v_play(e1) & n_child(x1))
exists p1 x1.(n_child(x1) & exists x2.(at(x1,x2) & n_school(x2)))