#prerequisite__requirement  something that is required in advance; "Latin was a prerequisite for admission"
  supertype:  responsibility__duty__obligation  the social force that binds you to your obligations and the courses of action demanded by that force: "we must instill a sense of duty in our children"; "every right implies a responsibility; every opportunity, an obligation; every possession, a duty"- John D.Rockefeller Jr
  subtype:  precondition  a condition that is a prerequisite
  subtype:  academic_requirement  a requirement for admission to or completion of an academic program
     subtype:  language_requirement  a requirement that a student know certain languages
  subtype:  essential_condition__essentialcondition__sine_qua_non  a prerequisite

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