C1111233131211111211113313231333133313331323221211113313311232321221   >>    C111123313121111121111331323133313331333132322121111331331123232122   <<    C1111233131211111211113313231333133313331323221211113313311232321223   >>      C1111233131211111211113313231333133313331323221211113313311232321222   >>