C11111211113313112113313331333133313231323223313232213232233121   >>    C1111121111331311211331333133313331323132322331323221323223312   <<    C11111211113313112113313331333133313231323223313232213232233123   >>      C11111211113313112113313331333133313231323223313232213232233122   >>