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@PRC_PRIV_ONLY = (
  'one string',
...
foreach my $element ( @PRC_PRIV_ONLY ) {
  $element .= ' appended data';
}

foreach my $element ( @PRC_PRIV_ONLY ) {
  $element = [ $element, '2nd element' ];
}

@PRC_PRIV_ONLY = ( 
  [ 'one string',    '2nd element' ],
  [ 'two strings',   '2nd element' ],
  [ 'three strings', '2nd element' ],
);