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* Edit the t/test_yy.t file; replace all former 'xx' 
  with 'yy'

* The t/test_yy.t script extracts the number of headlines
  in the t/test_yy.pp file. This determines the number of
  tests ...

* insert what you want to test into the t/test_yy.pp file

* setenv PP_DEBUG 1

* perl t/test_yy.t
  This creates the yy_*htm file which are not deleted due to
  the setting of PP_DEBUG

* Rename the yy_*htm files to yy_*.ref and store them in
  a corresponding d_yy directory
  
* DO NOT FORGET to update the MANIFEST file !!