C12313211232233312111111312111133133313331323133313331122332321212132112321   >>    C1231321123223331211111131211113313331333132313331333112233232121213211232   <<    C12313211232233312111111312111133133313331323133313331122332321212132112323   >>      C12313211232233312111111312111133133313331323133313331122332321212132112322   >>