apples and pears vs stepping

apples and pears

noun
  • stairs 

stepping

noun
  • The act of taking a step. 

  • A specific iteration of a model of central processing unit, often distinguished by the addition or removal of features compared to earlier examples of the same processor, or the presence, or lack thereof, of specific bugs. 

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