#clue__clew__cue  evidence that helps to solve a problem
  supertype:  evidence  an indication that makes something evident; "his trembling was evidence of his fear"
  subtype:  footprint__footmark__step  a mark of a foot or shoe on a surface; a clue that someone was present; "the police made casts of the footprints in the soft earth outside the window"
  subtype:  sign__mark  a perceptible indication of something not immediately apparent (as a visible clue that something has happened); "he showed signs of strain"; "they welcomed the signs of spring"
  subtype:  vestige__shadow  a clue that something has been present; "there wasn't a trace of evidence for the claim"

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