https://mailarchive.ietf.org/arch/msg/bier/DsCgUpvF3vsOYlQ7Ufw4qPZsp1c/
https://mailarchive.ietf.org/arch/msg/bier/9PhzZPoSeVnVU9ZB5cm45TfI8go/
https://mailarchive.ietf.org/arch/msg/bier/4O7WBcH-aptwBwPJ2kU56KI-VyM/
https://mailarchive.ietf.org/arch/msg/bier/KQAaHElJuMiCu_cSNQctdzQiqos/
https://mailarchive.ietf.org/arch/msg/bier/6myLHJ0-LLRmZEOaJ8_5pXF3wL8/
https://mailarchive.ietf.org/arch/msg/bier/3y_Bb_Xe2fD9HMyuQWJTyYASK0k/
https://mailarchive.ietf.org/arch/msg/bier/VCdpQIYeHdfkKRwv5JFPpBpz0RI/
https://mailarchive.ietf.org/arch/msg/bier/FVVk4_v3N05Jc8gmh9ixVuV96hY/
https://mailarchive.ietf.org/arch/msg/bier/rJ5sksi9_9UUU4Vl0X3gltLdTQI/
https://mailarchive.ietf.org/arch/msg/bier/tMcEP-1P51cme4BIQt8kObvWj38/