C12313211232233312111111312111133133313331323133313332322321123122312121   >>    C1231321123223331211111131211113313331333132313331333232232112312231212   <<    C12313211232233312111111312111133133313331323133313332322321123122312123   >>      C12313211232233312111111312111133133313331323133313332322321123122312122   >>