modified:   java/bitwise/FindTwoUniq.java
	modified:   java/other/ExpressionTree.java
	modified:   java/other/ZeroOnePack.java
	modified:   java/regex/ValidatePassword.java
	new file:   java/structure/AvlTree.java
	modified:   java/structure/BinarySearchTree.java
	new file:   java/structure/UnderflowException.java
	new file:   java/util/Factorization.java
	new file:   java/util/GcdAndLcm.java