Answer to Research paper problem
  1. author, paper, reaction, issue, journal
  2. writes, refer to, discuss, in, has
  3. many
  4. 1
  5. 0
  6. No. The existence of that relationship is mandatory.
  7. Yes. 1.
  8. 1.
  9. Yes. 1.
  10. 1.
  11. 1.
  12. No. The existence of that relationship is optional.
  13. 8. One for each entity type and one for writes, refer to, and discuss.
  14. 8.
  15. Paper.
  16. writes, refer to, and discuss

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