N 2n

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