C1111233131211111211113313331333133313211231211331323133313331312113313232211   >>    C111123313121111121111331333133313331321123121133132313331333131211331323221   <<    C1111233131211111211113313331333133313211231211331323133313331312113313232213   >>      C1111233131211111211113313331333133313211231211331323133313331312113313232212   >>