C12313211232233312111111312111133133313331323133313332322331212222123313311   >>    C1231321123223331211111131211113313331333132313331333232233121222212331331   <<    C12313211232233312111111312111133133313331323133313332322331212222123313313   >>      C12313211232233312111111312111133133313331323133313332322331212222123313312   >>