QPF vs SC

QPF

noun

  • SQ — Quebec police force — Sûreté du Québec 

SC

noun

  • supercentenarian 

  • simple cubic 

  • subcutaneous injection 

  • stem cell 

  • supercapacitor 

  • supercluster (of galaxies), galaxy superclsuter 

  • superconductor 

adj

  • subcutaneous 

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