they will walk duddits to school and back for the next five years or so , unless he is sick or they are at hole in the wall ; by the end of it duddits is no longer going to mary m. snowe , aka the retard academy , but to derry vocational , where he learns to bake cookies ( baitin tooties , in duddits-ese ) , replace car batteries , make change , and fie his own tie ( the knot is always perfect , although it sometimes appears about halfway down his shirt ) .