What is the structure of past perfect continuous?

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  1. #perfect
  2. #tense
  3. #known
  4. #participle
  5. #action
  6. #using
  7. #another
  8. #progressive
  9. #until
  10. #continued
  11. #present
  12. #constructed
  13. #started
  14. #continuous
  15. #shows