Add merged mixture dataset (all examples concatenated)

README.md

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+---
+dataset_info:
+  features:
+  - name: conversations
+    list:
+    - name: from
+      dtype: string
+    - name: value
+      dtype: string
+  splits:
+  - name: train
+    num_bytes: 1343255335
+    num_examples: 120727
+  download_size: 478900610
+  dataset_size: 1343255335
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
+---

data/train-00000-of-00002.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:714f6f90bc10b44c58e0861bf28015fe29f60a3dfc664c7e91dd5a79e7e01f56
+size 256481690

data/train-00001-of-00002.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:8d4da6fa786d38b2482f98cd55a69dd5ae07b18630bb3e231556f5a2f671a51a
+size 222418920