Idiomatically determine all the characters that can be used for symbols: Revision history

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11 March 2018

15 November 2017

18 September 2017

26 April 2015

2 April 2015

26 November 2014

23 November 2014

8 November 2014

16 September 2014

13 September 2014

12 September 2014

11 September 2014

26 March 2014

23 March 2014

21 March 2014

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