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  1. or download this
    sub a {
        print shift;
        my $answer = <STDIN>;
    ...
        return 1 if $answer =~ /y/i;
        return 0;
    }
    
  2. or download this
    my @t = (
        [
            undef,undef,
            ['cat','giraffe',"Is your animal larger than a breadbox?\n"]
        ]
    );
    
  3. or download this
    sub r{my$t=shift;my$x=a($t->[2][2]);$t->[$x]?r($t->[$x]):return $t->[2
    +][$x]}sub
    n{my$t=shift;for(0,1){if($t->[2][$_]eq$b&&!$t->[$_]){$t->[$_]=[undef,u
    +ndef,[$b,$
    a,$q]];return 1}last if$t->[$_]&&n($t->[$_])}}while(1){$b=r($t[0]);if(
    +!g($b)){$a
    =t();$q=i($b,$a);n($t[0])}last if!w()}