#logician__logistician  a person skilled at symbolic logic
  supertype:  #expert  a person with special knowledge or ability who performs skillfully
  instance:  #William_Stanley_Jevons  #Charles_Franklin_Peirce  #Willard_Van_Orman_Quine  #Bertrand_Arthur_William_Russell  #John_Venn
  subtype:  #dialectician  a logician skilled in dialectic
  subtype:  #syllogist__syllogizer__syllogiser  logician skilled in syllogistic reasoning

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