File: doduntil

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DO.UNTIL instructionlist tfexpression			(library procedure)

	command.  Repeatedly evaluates the "instructionlist" as long as the
	evaluated "tfexpression" remains FALSE.  Evaluates the first input
	first, so the "instructionlist" is always run at least once.  The
	"tfexpression" must be an expressionlist whose value when evaluated
	is TRUE or FALSE.