Second linked list
root2 = insert ( root2 , 1 ) ; root2 = insert ( root2 , 7 ) ; root2 = insert ( root2 , 4 ) ; root2 = insert ( root2 , 5 ) ; document . write ( " " ) ; display ( root2 ) ; root = newList ( root1 , root2 ) ; document . write ( " " ) ; display ( root ) ;