C12313211232233312111111312111133133313331323133313332221331212111313213221   >>    C1231321123223331211111131211113313331333132313331333222133121211131321322   <<    C12313211232233312111111312111133133313331323133313332221331212111313213223   >>      C12313211232233312111111312111133133313331323133313332221331212111313213222   >>