Examples of usage:

  1. In the parlour the Merle twin sat reading an instructive book. "The Wrong Twin" by Harry Leon Wilson
  2. It is very interesting to know what an important personage really did say or write upon remarkable occasions; but it is less instructive to be told what the historian thinks might have been a good speech or epistle for him to utter or indito. "Project Gutenberg History of The Netherlands, 1555-1623, Complete" by John Lothrop Motley
  3. In addition to the usual proof it is instructive to consider in class the cases in which the parallel is drawn through the two sides produced, either below the base or above the vertex, and also in which the parallel is drawn through the vertex. "The Teaching of Geometry" by David Eugene Smith

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