D12121212121313232233132332313231333132313233313113313233212121   >>    D1212121212131323223313233231323133313231323331311331323321212   <<    D12121212121313232233132332313231333132313233313113313233212123   >>      D12121212121313232233132332313231333132313233313113313233212122   >>