C1111233131211111211113313331333133313232321333133313331312133313222321   >>    C111123313121111121111331333133313331323232133313331333131213331322232   <<    C1111233131211111211113313331333133313232321333133313331312133313222323   >>      C1111233131211111211113313331333133313232321333133313331312133313222322   >>