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  1. or download this
    # pseudo
for <variable> ( list ) {
...
for my $key ( keys %hash ) {
    print "$key\n";
}
  2. or download this
    #psuedo
$hash{<key>} = <value>;

#read
$hash{foo} = 'bar';
  3. or download this
    #pseudo
@hash{<list of keys>} = <list of values>;

#real
@hash{ @keys } = @values;