permutation vs revision

permutation

noun
  • A transformation of a set's prime form, by applying one or more of certain operations, specifically, transposition, inversion, and retrograde. 

  • One of the ways something exists, or the ways a set of objects can be ordered. 

  • An ordering of a finite set of distinct elements. 

  • A one-to-one mapping from a finite set to itself. 

revision

noun
  • A changed edition, or new version; a modification. 

  • A story corrected or expanded by a writer commissioned by the original author. 

  • The action or process of reviewing something previously learned, especially one′s notes in preparation for a test or examination. 

  • The action or process of reviewing, editing and amending. 

verb
  • To provide with a new vision. 

How often have the words permutation and revision occurred in a corpus of books? (source: Google Ngram Viewer )