However, when using trees as a computational tool, one usually does have
latitude about how to structure a larger tree---in the same way that we had the
-freedom to implement our sets with lists whose members were just appended in
-the order we built the set up, or instead with lists whose members were ordered
-numerically.
+freedom to implement our [sets](/week4/#index9h1) with lists whose members were
+just appended in the order we built the set up, or instead with lists whose
+members were ordered numerically.
When building a new tree, one strategy for where to put the new element and
where to put the existing tree would be to always lean towards a certain side.