C11111211113313112113313331333133313331333132313331333133313332212121121   >>    C1111121111331311211331333133313331333133313231333133313331333221212112   <<    C11111211113313112113313331333133313331333132313331333133313332212121123   >>      C11111211113313112113313331333133313331333132313331333133313332212121122   >>