If I understand you correctly, you want to produce all possible combinations of elements from your arrays. Maybe it would be easier to generate indexes for arrays separately. It's like an odometer:
0 0 0
1 0 0
2 0 0
3 0 0
0 1 0
0 2 0
0 3 0
0 0 1
1 0 1
2 0 1
3 0 1
0 1 1
0 2 1
(etc)
So, your odometer looks like this (at first):
my @odometer = (0, 0, 0);
And you use it like this:
while_odometer_has_not_run_to_completion... {
$id2++;
(
$data{$id}{$id2}{'key1'},
$data{$id}{$id2}{'key2'},
$data{$id}{$id2}{'key3'},
)
=
(
$hash{$id}{'key1'}[ $odometer[0] ],
$hash{$id}{'key2'}[ $odometer[1] ],
$hash{$id}{'key3'}[ $odometer[2] ],
);
next_odometer( \@odometer );
}
...or something like that...
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