Create README.md

README.md

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+Finemath-4plus filtered using this code:
+```
+def my_filter(example):
+    lscore = example["language_score"] > 0.9
+    score = example["score"] > 4
+    lengh = example["token_count"] < 5000
+    return lscore and score and lengh
+```
+This remove 86% of the dataset in average.