Children are performing a routine on stage.
Children swimming in a pool
A stage is different from a pool.
exists e1 x1 x2 x3.(on(e1,x3) & n_stage(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_routine(x2) & n_child(x1))
exists x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_pool(x3) & n_swimming(x1) & (x1 = x2) & ne_nam_children(x2))