#lesson  a unit of instruction; "he took driving lessons"
  supertype:  #pedagogy__teaching__instruction  the profession of a teacher; "he prepared for teaching while still in college"; "pedagogy is recognized as an important profession"
  part of:  #course
  subtype:  #language_lesson  a period of instruction learning a language
     subtype:  #French_lesson  instruction in the French language
     subtype:  #German_lesson  instruction in the German language
     subtype:  #Hebrew_lesson  instruction in the Hebrew language
  subtype:  #dance_lesson__dancelesson  a lesson in dancing
  subtype:  #music_lesson__musiclesson  a lesson in performing music
     subtype:  #piano_lesson__pianolesson  a lesson in playing the piano
     subtype:  #violin_lesson  a less in playing the violin
  subtype:  #tennis_lesson  a lesson in playing tennis
  subtype:  #golf_lesson  a lesson in playing gold

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