HP vs installment

HP

noun
  • Hit points; health points. 

name
  • The Hewlett-Packard Company 

  • Harry Potter 

installment

noun
  • A part of a published or broadcast serial. 

  • One of a series of parts, whether equal or unequal to the other parts of the series, of a given entity or a given process, which part presents or is presented at a particular scheduled interval. 

  • One member of a series of portions of a debt or sum of money, which portions may or may not be equated (depending in part on whether the interest rate is fixed or variable), payment of which portions are serially exacted at regularly scheduled intervals toward satisfaction of the total. Payments of installments are generally mensual, quarterly, triannual, biannual, or annual. 

  • The act of installing; installation. 

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