C1111233131211111211113313331333133313331333133313331333133313112232223221   >>    C111123313121111121111331333133313331333133313331333133313331311223222322   <<    C1111233131211111211113313331333133313331333133313331333133313112232223223   >>      C1111233131211111211113313331333133313331333133313331333133313112232223222   >>