C1111233131211111211113313331333133313331312331333131211111333133313221312321   >>    C111123313121111121111331333133313331333131233133313121111133313331322131232   <<    C1111233131211111211113313331333133313331312331333131211111333133313221312323   >>      C1111233131211111211113313331333133313331312331333131211111333133313221312322   >>