list 1
Node n1 = new Node ( 1 ) ; n1 . next = new Node ( 2 ) ; n1 . next . next = new Node ( 3 ) ; n1 . next . next . next = new Node ( 4 ) ; n1 . next . next . next . next = new Node ( 5 ) ; n1 . next . next . next . next . next = new Node ( 6 ) ; n1 . next . next . next . next . next . next = new Node ( 7 ) ;