Well, if a textbook for 18-22 yr olds (as most textbooks are for
  college students) is gonna be preachy about something while
  teaching something else, I couldn't think of a better example
  than that.[1]deductive-logiceductive logic

References

  Visible links
  1. http://icopiedyou.com/wp-content/uploads/2016/03/deductive-logic.jpg