N 2n

N 2nN 2nN 2nN 2n
N 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2n
N 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2n
N 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2n
N 2nN 2nN 2nN 2nN 2nN 2nN 2nN 2n