swapped lines for alphabetical order

books/free-programming-books-subjects.md

@@ -148,11 +148,11 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Introduction to Autonomous Robots](https://github.com/correll/Introduction-to-Autonomous-Robots/releases) - Nikolaus Correll (PDF) (CC BY-NC-ND)
 * [Machine Learning For Dummies®, IBM Limited Edition](https://www.ibm.com/downloads/cas/GB8ZMQZ3) - Daniel Kirsch, Judith Hurwitz (PDF)
 * [On the Path to AI: Law’s prophecies and the conceptual foundations of the machine learning age](https://link.springer.com/book/10.1007/978-3-030-43582-0) - Thomas D. Grant, Damon J. Wischik (PDF, EPUB)
+* [Natural Language Processing with Transformers](https://github.com/cyb0rg14/deeplearning/blob/master/book/natural-language-processing-with-transformers-revised-edition.pdf) - Lewis Tunstall, Leandro von Werra & Thomas Wolf (PDF)
 * [Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp](https://github.com/norvig/paip-lisp) - Peter Norvig
 * [Probabilistic Programming & Bayesian Methods for Hackers](https://camdavidsonpilon.github.io/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers/) - Cam Davidson-Pilon (HTML, Jupyter Notebook)
 * [The History of Artificial Intelligence](https://courses.cs.washington.edu/courses/csep590/06au/projects/history-ai.pdf) - Chris Smith, Brian McGuire, Ting Huang, Gary Yang (PDF)
 * [The Quest for Artificial Intelligence: A History of Ideas and Achievements](https://ai.stanford.edu/~nilsson/QAI/qai.pdf) - Nils J. Nilsson (PDF)
-* [Natural Language Processing with Transformers](https://github.com/cyb0rg14/deeplearning/blob/master/book/natural-language-processing-with-transformers-revised-edition.pdf) - Lewis Tunstall, Leandro von Werra & Thomas Wolf (PDF)