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  1. or download this
    
    my $key = $institution
              && ($valid_institution{lc($institution)} || "other")
              || "unaffiliated";
    
  2. or download this
    ## I'm promising that the true branch here can NEVER EVER EVER
    ## return a false value, which would have caused the
    ...
    ## updating this code, please continue to maintain
    ## this precondition, which I have placed precariously
    ## and needlessly in this code. Have a nice day.
    
  3. or download this
    my $key = $institution
              ? ($valid_institution{lc($institution)} || "other")
              : "unaffiliated";