--- a/src/main/csharp/jp.ac.u-ryukyu.ie.cr/jungle/data/list/DefaultNode.cs	Mon Jul 04 03:50:34 2016 +0900
+++ b/src/main/csharp/jp.ac.u-ryukyu.ie.cr/jungle/data/list/DefaultNode.cs	Tue Jul 05 07:20:41 2016 +0900
@@ -33,17 +33,16 @@
 	}
 
 	public Node<T> add(int currentNum, int num, T attribute) {
-		Node<T> newNode;
 		if (currentNum == num) {
-			newNode = new DefaultNode<T>(attribute, this.next);
+			Node<T> newNode = new DefaultNode<T>(attribute, this.next);
 			return new DefaultNode<T>(this.attribute,  newNode);
 		}
 
-		newNode = next.add(currentNum + 1, num, attribute);
-		if (newNode == null)
+		Node<T> newNodes = next.add(currentNum + 1, num, attribute);
+		if (newNodes == null)
 			return null;
 
-		return new DefaultNode<T>(this.attribute, newNode);
+		return new DefaultNode<T>(this.attribute, newNodes);
 	}
 
 	public Node<T> delete(int currentNum, int deleteNum) {

--- a/src/main/csharp/jp.ac.u-ryukyu.ie.cr/jungle/data/list/headNode.cs	Mon Jul 04 03:50:34 2016 +0900
+++ b/src/main/csharp/jp.ac.u-ryukyu.ie.cr/jungle/data/list/headNode.cs	Tue Jul 05 07:20:41 2016 +0900
@@ -22,16 +22,15 @@
 	}
 
 	public Node<T> add(int currentNum, int num, T attribute) {
-		Node<T> newNode;
 		if (num == 0) {
-			newNode = new DefaultNode<T>(attribute, next);
+			Node<T> newNode = new DefaultNode<T>(attribute, next);
 			return new headNode<T>(newNode);
 		}
-		newNode = next.add(currentNum + 1, num, attribute);
-		if (newNode == null) {
+		Node<T> newNodes = next.add(currentNum + 1, num, attribute);
+		if (newNodes == null) {
 			return this;
 		}
-		return new headNode<T>(newNode);
+		return new headNode<T>(newNodes);
 	}
 
 	public Node<T> addLast(T attribute) {