C12313211232233312111111312111133133313331333132232233122322122221   >>    C1231321123223331211111131211113313331333133313223223312232212222   <<    C12313211232233312111111312111133133313331333132232233122322122223   >>      C12313211232233312111111312111133133313331333132232233122322122222   >>