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    $e = sprintf( '%s', undef );;
Use of uninitialized value in sprintf at (eval 28) line 1, <STDIN> lin
+e 20.
  2. or download this
    
eval{ 
...
    $e = sprintf( '%s', undef ); 
};;
Warning detected: Use of uninitialized value in sprintf at (eval 29) l
+ine 1, <STDIN> line 21.