#positive_stimulus  a stimulus with desirable consequences
  supertype:  #stimulus__stimulation__stimulant__input  any stimulating information or event; acts to arouse action
  subtype:  #fillip__bonus__bonu  anything that tends to arouse; "his approval was an added fillip"
  subtype:  #joy__delight__pleasure  something or someone that provides pleasure; a source of happiness; "a joy to behold"; "the pleasure of his company"; "the new car is a delight"

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