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Returning values with a procedure.

This is probably simple but I have never done it and can't find an example of how to do it. I have an application that looks to me like it should use procedures that will return values. Here is an example of what I'd like to do:

c eval Duty = CanadianDuty(parm1: parm2: parm3)

and the procedure CanadianDuty would have 3 parameters as input and return the value of the duty.

I believe I can do that process, but I *know* I have no idea how to do the same thing where I need to return 2 values, say "Duty" and "Tariff". I am sure this solution would be wrong! :)

c eval Duty = CanadianDuty(parm1: parm2: parm3)
c eval Tariff = CanadianDuty(parm1: parm2: parm3)

and this would also be wrong:

c eval Duty:Tariff = CanadianDuty(parm1: parm2: parm3)

Any pointers would be appreciated. Thanks.


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