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--
subject			fact

--	can be used in prefix or postfix form
	has example example expression equivalent longer expression a--; b=a--; --a; b=--a; a=a-1; b=a; a=a-1; a=a-1; a=a-1; b=a;
	is a subtopic of The Basics of Java
	is an instance of Java special operator
Java special operator	has purpose to shorten certain expressions