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my @array_of_objects = (
    { sex=>'Male', occupation=>'foo' },
...
$VAR1 = { 'Female' => 3, 'Male' => 2 };
$VAR2 = { 'Female' => { 'bar' => 1, 'foo' => 2 },
          'Male' => { 'foo' => 1, 'bar' => 1 } };

sub count {
    my ($data, $fields) = @_;
...
print Dumper( count(\@array_of_objects, 'sex') );
print Dumper( count(\@array_of_objects,
    ['sex','occupation']) );