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  1. or download this
        $VAR1 = 'ng1';
        $VAR2 = [
    ...
                   'ng2_1_u2',
                   'ng2_1_u3'
                 ];
    
  2. or download this
        $VAR1 = 'ng1';
        $VAR2 = [
    ...
                  'ng3_4'
                ];
    
  3. or download this
        $VAR1 = 'ng1';
        $VAR2 = [
    ...
                   'ng2_1_u2',
                   'ng2_1_u3'
                 ];
    
  4. or download this
        #!/usr/bin/perl
        use strict;
    ...
            }
          }
        }