level set vs pleasantness

level set

noun
  • A state of mutual understanding among parties 

  • An event consisting of level setting 

  • The set of values x for which a real-valued function f(x) is equal to a given constant. 

verb
  • To establish a baseline of mutual understanding 

pleasantness

noun
  • The state or quality of being pleasant. 

  • Something pleasant. 

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