Hardness: Revision history

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Diff selection: Mark the radio buttons of the revisions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with latest revision, (prev) = difference with preceding revision, m = minor edit.

1 June 2019

16 November 2018

9 April 2017

8 November 2016

6 December 2015

5 December 2015