C1111233133313231133133313331333131211111331121211113313233232213121   >>    C111123313331323113313331333133313121111133112121111331323323221312   <<    C1111233133313231133133313331333131211111331121211113313233232213123   >>      C1111233133313231133133313331333131211111331121211113313233232213122   >>