C1111233131211111211113313331333133313232321333133313121133133322121   >>    C111123313121111121111331333133313331323232133313331312113313332212   <<    C1111233131211111211113313331333133313232321333133313121133133322123   >>      C1111233131211111211113313331333133313232321333133313121133133322122   >>