C12313211232233312111111312111133133313331323133313332322331212222122322221   >>    C1231321123223331211111131211113313331333132313331333232233121222212232222   <<    C12313211232233312111111312111133133313331323133313332322331212222122322223   >>      C12313211232233312111111312111133133313331323133313332322331212222122322222   >>