The code in Re: Howto avoid large hard-coded else-if function calls seems to be an almost exact match for your requirement.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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In reply to Re: subroutines - creating a custom subroutine and 'subroutine redefined' errors by BrowserUk
in thread subroutines - creating a custom subroutine and 'subroutine redefined' errors by Anonymous Monk

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