my @aoh1 = qw (value1 value2);
my @aoh2 = qw (value3 value4);

@aoh2 = (@aoh1, @aoh2);

##</code><code>##

@aoh2 = ('value1',
         'value2',
         'value3',
         'value4'
        );

##</code><code>##

@aoh1 = ({ 'key1' => 'value1', 
           'key2' => 'value2' });
@aoh2 = ({ 'key3' => 'value3',
           'key4' => 'value4' });

@aoh2 = (@aoh1, @aoh2);

##</code><code>##

@aoh2 = (
          {
            'key2' => 'value2',
            'key1' => 'value1'
          },
          {
            'key4' => 'value4',
            'key3' => 'value3'
          }
        );