piibunina

[piibunina @piibunina]

@yuhangyuan_ I feel alive 🙂.

[piibunina @piibunina]

@youwannacranson This is not professional cretinism. This is unprofessional cretinism.

[piibunina @piibunina]

@zou_jingyuan thanks ...

[piibunina @piibunina]

@chngymdaily Credit Han Bing. Posted on a whim without asking permission.

[piibunina @piibunina]

@chngymdaily Qiu Qiyuan and Zhou Yaqin (2017)

[piibunina @piibunina]

@LubaBaladzhaeva Luba, Oleg seems to be right. Technical Regulations 2023 on the FIG site, Section 2 for AG, page 19 in the end.