C1111233131211111211113313331333133313232321333133313331322331333312121   >>    C111123313121111121111331333133313331323232133313331333132233133331212   <<    C1111233131211111211113313331333133313232321333133313331322331333312123   >>      C1111233131211111211113313331333133313232321333133313331322331333312122   >>