C1111233131211111211113313331333133313211231211331323133313232212111113233231   >>    C111123313121111121111331333133313331321123121133132313331323221211111323323   <<    C1111233131211111211113313331333133313211231211331323133313232212111113233233   >>      C1111233131211111211113313331333133313211231211331323133313232212111113233232   >>