#question.subject__head  the subject matter at issue; "the question of disease merits serious discussion"; "under the head of minor Roman poets"
  supertype:  subject__topic__theme  the subject matter of a conversation or discussion; "he didn't want to discuss that subject"; "it was a very sensitive topic"; "his letters were always on the theme of love"
  subtype:  problem  a question raised for consideration or solution; "our homework consisted of ten problems to solve"
     subtype:  puzzler__puzzle__mystifier  a particularly baffling problem that is said to have a correct solution; "he loved to solve chessmate puzzles"; "that's a real puzzler"
     subtype:  case.problem  a problem requiring investigation; "Perry Mason solved the case of the missing heir"
     subtype:  homework_problem  a problem that students are assigned to do outside of class
     subtype:  conundrum__riddle__enigma__brain-teaser__brainteaser  a difficult problem
     subtype:  stumper__toughie__sticker  a particularly difficult or baffling question or problem
     subtype:  Gordian_knot.problem__gordianknot  any very difficult problem; insoluble in its own terms
     subtype:  crossword_puzzle__crosswordpuzzle  a puzzle in which words corresponding to numbered clues are to be found and written in to squares in the puzzle
     subtype:  word_square__acrostic  a puzzle where you fill a square grid with words reading the same down as across
     subtype:  pons_asinorum  a problem that severely tests the ability of an inexperienced person
     subtype:  rebus__rebu  a puzzle where you decode a message consisting of pictures representing syllables and words
  subtype:  question_of_fact__matter_of_fact  a disputed factual contention that is generally left for a jury to decide
  subtype:  question_of_law__matter_of_law  a disputed legal contention that is generally left for a judge to decide

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