C11112331312111112111133132313331333133313232212111113331333132232223222313121   >>    C1111233131211111211113313231333133313331323221211111333133313223222322231312   <<    C11112331312111112111133132313331333133313232212111113331333132232223222313123   >>      C11112331312111112111133132313331333133313232212111113331333132232223222313122   >>