Create README.md

README.md

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+---
+license: cc-by-4.0
+language:
+- en
+---
+
+CORE task as adapted for "Tokenization is Sensitive to Language Variation paper", see [arxiv](https://arxiv.org/abs/2502.15343). 
+Originally downloaded from [https://github.com/TurkuNLP/CORE-corpus](https://github.com/TurkuNLP/CORE-corpus), see also [Register identification from the unrestricted open Web using the Corpus of Online Registers of English](https://link.springer.com/article/10.1007/s10579-022-09624-1). If you want to use the original CORE dataset refer to these original sources. 
+
+```
+@article{wegmann2025tokenization,
+  title={Tokenization is Sensitive to Language Variation},
+  author={Wegmann, Anna and Nguyen, Dong and Jurgens, David},
+  journal={arXiv preprint arXiv:2502.15343},
+  year={2025}
+}
+```