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 * [lab4.1](./Documentations/4.1-ssa/)
   + DDL：2022-11-27 23:59:59 (UTC+8)
 
+* [lab4.2](./Documentations/4.2-gvn/)
+  + DDL: 2022-12-12 23:59:59 (UTC+8)
+
 ## FAQ: How to merge upstream remote branches
 
 In brief, you need another alias for upstream repository (we assume you are now in your local copy of forked repository on Gitlab):