diff --git a/tetris.py b/tetris.py
--- a/tetris.py
+++ b/tetris.py
@@ -27,30 +27,25 @@ for (name,piece) in pieces:
 				for coords in fit: row[index[coords]]=1
 				matrix.append(row)
 
-# print(header)
-# for row in matrix: print(row)
+print(header)
+for row in matrix: print(row)
 
 columns=[]
 head=Header()
 for label in header:
 	c=Column(label)
-	head.left.right=c
-	c.left=head.left
-	head.left=c
-	c.right=head
+	c.attachRight(head)
 	columns.append(c)
 
 for row in matrix:
 	cells=[]
 	for (item,col) in zip(row,columns):
 		if item!=1: continue
-		c=Cell(up=col.up,down=col,col=col)
-		col.up.down=c
-		col.up=c
+		c=Cell(col)
+		c.attachDown(col)
 		cells.append(c)
-		c.right=cells[0]
-		c.left=cells[0].left
-		c.left.right=c
-		c.right.left=c
+		c.attachRight(cells[0])
+		col.size+=1
 
+print()
 head.search()