Dear monks
yesterday, i got a n exellent answer from 'perldeveloper' ;
the cod3e he gave me is :
my $dat0 = 'a.txt';

open (DAT, "$dat0") or die "Could not open file `$dat0'.\n";
my @all=<DAT>;
close (DAT);

my @words = ();
my $sentences = {}; # 'word' => [ sentences that start with `word' ]
foreach my $sentence (@all) {
    chomp ($sentence);
    push (@words, [ split (/[ \t]+/, $sentence) ]);
    my $firstWord = $words[-1]->[0];
    $sentences->{$firstWord} = [] if not exists $sentences->{$firstWor
+d};
    push (@{$sentences->{$firstWord}}, $#words);
}

my @temp = ('', '');
for (my $i = 0; $i <= $#words; $i++) {
    push (@temp, $all[$i]);
    my @referencedSentences = ();
    foreach my $j (@{$words[$i]}) {
        if (($j ne "$j") || ($j ne "v")) { # I don't get this so I lea
+ve it intact
            if (exists $sentences->{$j}) {
                push (@referencedSentences, $sentences->{$j});
            }
        }
    }
    push (@temp, \@referencedSentences);
}

print "Done.\n";

[download]

Now, I asked him 2 simple questions for which i have waited for most of the ight, but no one answered me.
So, if you can, please answer me on 2 simple westions about this script :
1. when i'd like to find a word in @temp, i should use : 

if (exists $sentences->{$someInput}) {
push (@referencedSentences1,$sentences->{$someInput});}

[download]
?
2. when the main loop(first foreach loop in this code) ends and everything is refered, when a word is refared it it's "array"(meaning), are all the wods in the array refered to their "arrays" as well ?

In reply to looking at a hash by chiburashka

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