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function string
  1. <?php
  2.  
  3. $f = function(string $a): string {
  4.         return $a . '1';
  5. };
  6.  
  7. $a = $f('a');
  8.  
  9. fwrite(STDOUT, $a);
  10. // a1
  11. // your code goes here
  12.  
  13. ?>
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