C1111233131211111211113313331333133313331312331333133323213232221   >>    C111123313121111121111331333133313331333131233133313332321323222   <<    C1111233131211111211113313331333133313331312331333133323213232223   >>      C1111233131211111211113313331333133313331312331333133323213232222   >>