Untested code:
use 5.010;
my $hash = {
array_key => ['one', 'two', 'three'],
scalar_key => 'four',
};
while (my ($key, $value) = each %$hash) {
foreach my $element ("ARRAY" eq ref $value ? @$value : $value) {
say "($key, $element)"
}
}
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