©2008–2018 Jiří Lebl
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During the writing of these notes, the author was in part supported by NSF grant DMS-0900885 and DMS-1362337.
The date is the main identifier of version. The major version / edition number is raised only if there have been substantial changes. Edition number started at 5, that is, version 5.0, as it was not kept track of before.
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