TMTOWTDI

#!/usr/bin/perl -w
use strict;
my %allowed_reply= (
  yes => 1,
  no => 1,
);

my $var = "yes";

if ( $allowed_reply{$var} ) {
    print  "You choose $var\n";
 }else{
    print  "you chose something other then yes or no\n"
}
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