Simple PPDB: A Paraphrase Database for Simplification Ellie Pavlick author Chris Callison-Burch author 2016-08 text Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics (Volume 2: Short Papers) Katrin Erk editor Noah A Smith editor Association for Computational Linguistics Berlin, Germany conference publication pavlick-callison-burch-2016-simple 10.18653/v1/P16-2024 https://aclanthology.org/P16-2024/ 2016-08 143 148