A boy and a toddler boy stand by a water fountain.
The boys are outside by a fountain.
A boy and a boy toddler are boys.     A water fountain is usually outside.
exists s1 x1 x2 x3 x4 x5 x6.(a_topic(s1) & subset_of(x2,s1) & by(x2,x5) & n_fountain(x5) & of(x5,x6) & n_water(x6) & n_stand(x2) & of(x2,x4) & n_boy(x4) & of(x2,x3) & n_toddler(x3) & subset_of(x1,s1) & n_boy(x1))
exists s1 x1 x2.(n_boy(x1) & by(s1,x2) & n_fountain(x2) & Theme(s1,x1) & a_outside(s1))