#lesson.school_assignment  a task assigned for individual study; "he did the lesson for today"
  supertype:  school_assignment  a school task performed by a student to satisfy the teacher
  part of:  educational_activity
  subtype:  exercise.lesson__example  a task performed or problem solved in order to develop skill or understanding; "you must work the examples at the end of each chapter in the textbook"
  subtype:  reading_assignment__readingassignment  the reading of a passage assigned by the teacher
  subtype:  recitation  an instance of a student reciting a lesson that has been learned
  subtype:  history_lesson__historylesson  a less in the facts of history

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