C11111211113313112113313331333133313331333132313231333132312121   >>    C1111121111331311211331333133313331333133313231323133313231212   <<    C11111211113313112113313331333133313331333132313231333132312123   >>      C11111211113313112113313331333133313331333132313231333132312122   >>