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vvalue : primitive vector_sep(?) vvalue
         { [ $item[1], @{$item[3]} ] }
       | primitive vector_sep(?)
         { [ $item[1] ] }

vvalue  : vvalue_(s)
          { [ map { @$_ } @{$item[1]} ] }
vvalue_ : primitive vector_sep(?)
          { [ $item[1] ] }

$result = [
            '2',
...
            '13',
            '17'
          ];