#lecture_demonstration__lecturedemonstration  presentation of an example of what the lecturer is discoursing about
  supertype:  #presentation.show__presentment__demonstration  the act of presenting something; "he gave the customer a demonstration"
  part of:  #lecturing__lecture  teaching by giving a discourse on some subject (typically to a class)
     part of:  #course__course_of_instruction__course_of_study__class__clas  education imparted in a series of lessons or class meetings; "he took a course in basket weaving"; "flirting is not unknown in college classes"

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