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Revision 07fc868ecfd31fecc7c3f964730f946c31f5ab80 authored by Joshua J. Cogliati on 19 June 2020, 15:11:03 UTC, committed by Joshua J. Cogliati on 19 June 2020, 15:11:03 UTC 
Fixing save load session file bug with code by pahihu.
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minus 
MINUS num
- num

	outputs the negative of its input.  Minus sign means unary minus if
	the previous token is an infix operator or open parenthesis, or it is
	preceded by a space and followed by a nonspace.  There is a difference
	in binding strength between the two forms:

		MINUS 3 + 4	means	-(3+4)
		- 3 + 4		means	(-3)+4
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