Art of Problem Solving
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1959 IMO Problems/Problem 4: Revision history

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15 July 2023

17 August 2022

23 June 2021

26 September 2020

23 January 2020

3 August 2019

28 November 2018

17 February 2018

18 July 2017

19 July 2016

27 August 2014

30 May 2012

25 October 2007

26 July 2006