C11112331333132311331333133313331333132313233313112211232322121   >>    C1111233133313231133133313331333133313231323331311221123232212   <<    C11112331333132311331333133313331333132313233313112211232322123   >>      C11112331333132311331333133313331333132313233313112211232322122   >>