reformulate vs reissue

reformulate

verb
  • To formulate again or differently. 

reissue

verb
  • To issue again. 

  • In patent law: to permit a patent with ministerial errors to be corrected and enforced for the remainder of the original term of the patent. 

  • To reprint a series of postage stamps from old plates. 

noun
  • Something that has issued, or been issued again. 

  • A second or subsequent printing of postage stamps from old plates. 

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