C r 4

C r 4C r 4C r 4C r 4
C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4
C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4
C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4
C r 4C r 4C r 4C r 4C r 4C r 4C r 4C r 4