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[REBOL] what if a function requires multiple argument-based refinements?

From: princepawn:lycos at: 28-Aug-2000 7:43

This is a bit of an abstract question by a person who is 1/3rd of the way through the McGraw text, but I just keep popping with questions. What if I had the following:
>> f: func [ a /ref1 arg1 /ref2 arg2] [ either ref2 [ print "ref2" ] [ print "no ref2" ] ] >> f/ref1 3 /ref2 4 1
no ref2 == 1
how could I call the function "f" to make use of both refinements?