C11111211113313112113313331333133313331312111133112211232322121   >>    C1111121111331311211331333133313331333131211113311221123232212   <<    C11111211113313112113313331333133313331312111133112211232322123   >>      C11111211113313112113313331333133313331312111133112211232322122   >>