disarticulate vs unlink

disarticulate

verb
  • To disjoint. 

  • To amputate (a limb) at a joint without cutting the bone. 

unlink

verb
  • To delete (a file). 

  • To decouple; to remove a link from, or separate the links of. 

noun
  • A link that is equivalent (under ambient isotopy) to finitely many disjoint circles in the plane. 

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