1 7 4 9 9 7 8 7 4 5 1 5 7 3 7 8 2 4 9 9 7 3 2 8 5 1 5 7 4 2 3 6 8 9 9 2 4 6 3 5 1 5 2 8 6 4 6 3 9 9 6 8 6 4 1 6 8 I believe that all other ways are rotations of this one. (But I haven't proved it.)