Add formatted data from renma/ProofWriter (all splits, improved logic)

README.md

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+---
+dataset_info:
+  features:
+  - name: question
+    dtype: string
+  - name: answer
+    dtype: string
+  - name: thinking
+    dtype: string
+  - name: content
+    dtype: string
+  - name: id
+    dtype: int64
+  splits:
+  - name: validation
+    num_bytes: 554621
+    num_examples: 600
+  download_size: 122330
+  dataset_size: 554621
+configs:
+- config_name: default
+  data_files:
+  - split: validation
+    path: data/validation-*
+---

data/validation-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:5daf4bd068f754fc08a3fae85940dae2a95deaecdea995541cc9746d3a74b4b6
+size 122330