If you want all the unique keys from all the array elements, you can traverse it similar to as described above, and just keep track (in a hash) of the keys you've seen.
my %allKeys;
foreach my $i ( 0 .. $#data ){
my $hash = $data[$i];
for (keys %$hash) {
push @{$allKeys{$_}}, $i;
}
}
foreach my $key ( sort keys %allKeys ){
my $locations = $allKeys{$key};
printf "Key '%s' was seen %d times at these indices: %s\n",
$key, scalar @$locations, join(", ", @$locations);
}
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