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  1. or download this
    @AoH =
    (
            { name => Adam, age => 0 },
    ...
    @age_ref = (\$AoH[0]{age},\$AoH[2]{age});
    print "\${\$age_ref[1]} = ${$age_ref[1]} =  $AoH[2]{age}\n";
    # prints ${$age_ref[1]} = 20 =  20