C1111233131211111211113313331333133313232321333133313331333211232233312121   >>    C111123313121111121111331333133313331323232133313331333133321123223331212   <<    C1111233131211111211113313331333133313232321333133313331333211232233312123   >>      C1111233131211111211113313331333133313232321333133313331333211232233312122   >>