Update README.md

andrewcropper · web-flow · commit 8b1d61449d1a · 2025-04-03T12:58:47.000+03:00
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 Popper is an [inductive logic programming](https://arxiv.org/pdf/2008.07912.pdf) system.  If you use Popper, please cite the paper [Learning programs by learning from failures](https://arxiv.org/abs/2005.02259) (MLJ 2021).
 
-If you have any questions about Popper, ask us in [Discord](https://discord.gg/Rv5mQCayAp) or email [Andrew Cropper](mailto:andrew.cropper@cs.ox.ac.uk).
+If you have any questions about Popper, ask us on [Discord](https://discord.gg/Rv5mQCayAp) or email [Andrew Cropper](mailto:andrew.cropper@cs.ox.ac.uk).
 
 #### Requirements
 - [SWI-Prolog](https://www.swi-prolog.org) (9.2.0 or above)

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 Popper is an [inductive logic programming](https://arxiv.org/pdf/2008.07912.pdf) system.  If you use Popper, please cite the paper [Learning programs by learning from failures](https://arxiv.org/abs/2005.02259) (MLJ 2021).
 -If you have any questions about Popper, ask us in [Discord](https://discord.gg/Rv5mQCayAp) or email [Andrew Cropper](mailto:[email protected]).
 +If you have any questions about Popper, ask us on [Discord](https://discord.gg/Rv5mQCayAp) or email [Andrew Cropper](mailto:[email protected]).
 #### Requirements
 - [SWI-Prolog](https://www.swi-prolog.org) (9.2.0 or above)