the first part build a hash of arrays with the numbers as the key.
%h = (
'1' => [
'hello',
'you',
'tree'
],
'3' => [
'sun',
'grass'
],
'2' => [
'people',
'fun'
],
...
);
The second for loop grap the array and join the words.
To grap a entry use
$num = 1;
$string = join '', @{$h{$num}}; # string is now helloyoutree
$num = 4; # select the string with number 4 ( lovefood )
$string = join '', @{$h{$num}};
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