Reading material

Pages 132-133, 137-138 and 144-151.

Additional material

A binary tree is an ordered tree in which each node has A strong binary tree is an ordered tree in which each node has Sequence.java
RankedSequenceException.java
PositionalSequenceException.java
Tree.java
TreeException.java
BinaryTree.java
java.util.Vector
java.util.Enumeration