C1111233131211111211113313331333133313211231211331323133313232122121   >>    C111123313121111121111331333133313331321123121133132313331323212212   <<    C1111233131211111211113313331333133313211231211331323133313232122123   >>      C1111233131211111211113313331333133313211231211331323133313232122122   >>