precation vs solicitation

precation

noun
  • A prayer or act of praying; an earnest request. 

solicitation

noun
  • the action or instance of soliciting; petition; proposal 

  • an inchoate offense that consists of a person offering money or inducing another to commit a crime with the specific intent that the person solicited commit the crime 

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