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Text File  |  2004-03-30  |  148 b   |  11 lines
  1. gender isa thing.
  2. male isa gender.
  3. female isa gender.
  4.  
  5. person isa thing.
  6. john isa person.
  7. john is male.
  8.  
  9. mary isa person.
  10. mary is female.
  11.