C12313211232233312111111312111133133313331333132232233122322121323232321   >>    C1231321123223331211111131211113313331333133313223223312232212132323232   <<    C12313211232233312111111312111133133313331333132232233122322121323232323   >>      C12313211232233312111111312111133133313331333132232233122322121323232322   >>