Children in uniforms chase pigeons.
Some children are outside.
Children who chase pigeons are outside.
exists x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_chase(x2) & Time(x2,x3) & n_pigeon(x3) & n_uniform(x2) & n_child(x1))
exists s1 x1.(Theme(s1,x1) & a_outside(s1) & n_child(x1))