C1111233131211111211113313331333133313331313221131211113313232213222212121   >>    C111123313121111121111331333133313331333131322113121111331323221322221212   <<    C1111233131211111211113313331333133313331313221131211113313232213222212123   >>      C1111233131211111211113313331333133313331313221131211113313232213222212122   >>