Add some pointers to earlier readings

trees/uts-0018.tree

@@ -219,11 +219,33 @@ The readings during this period are reflected in [[spin-0001]]. Some are yet to
 }
 
 \mdblock{01-01~06-14}{
-The readings during this period are reflected in [My math interests in 2024](https://utensil.github.io/blog/posts/math-2024/).
+The readings during this period are reflected in
+
+- [My math interests in 2024](https://utensil.github.io/blog/posts/math-2024/)
+- [Studying group algebras with GAP](https://utensil.github.io/blog/posts/group-algebra/)
+- [Notes on Zeon Algebra](https://utensil.github.io/blog/posts/zeon-algebra/)
+}
 }
 
 }
 
+\subtree[2023]{
+\title{Year 2023}
+\subtree[2023-09~12]{
+\title{September to December, 2023}
+\md{
+I was working on Lean related projects during this period, my readings are partially reflected in my [Lean 4 Playground](https://utensil.github.io/lean-playground/).
+}
+}
+\subtree[2023-02~08]{
+\title{February to August, 2023}
+\md{
+The readings during this period are reflected in
+
+- my [LLM Daily Picks](https://github.com/utensil/llm-playground/blob/main/daily_picks.md)
+- my blog post [Transformers: from self-attention to performance optimizations](https://utensil.github.io/blog/posts/transformer/)
+}
+}
 }
 
 }