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sub a {
    print shift;
    my $answer = <STDIN>;
...
    return 1 if $answer =~ /y/i;
    return 0;
}

my @t = (
    [
        undef,undef,
        ['cat','giraffe',"Is your animal larger than a breadbox?\n"]
    ]
);

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()}