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+The list of used libraries. Many thanks for their authors:
+
+* [D3.js v.4](https://d3js.org) by Mike Bostock
+* [jQuery v. 3.1.1](https://code.jquery.com/jquery-3.1.1.min.js) and [jQuery-ui](https://jqueryui.com)
+* [Polylabel](https://github.com/mapbox/polylabel) by Vladimir Agafonkin
+* [Priority-queue](https://github.com/adamhooper/js-priority-queue) by Adam Hooper
+* [Quantize](https://gist.github.com/thinkxl/4262930) by Nick Rabinowitz
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