C12313211232233312111111312111133133313331323133313331122332321122112212321   >>    C1231321123223331211111131211113313331333132313331333112233232112211221232   <<    C12313211232233312111111312111133133313331323133313331122332321122112212323   >>      C12313211232233312111111312111133133313331323133313331122332321122112212322   >>