SC vs Sf

SC

noun
  • simple cubic 

  • supercentenarian 

  • subcutaneous injection 

  • stem cell 

  • supercapacitor 

  • supercluster (of galaxies), galaxy superclsuter 

  • superconductor 

adj
  • subcutaneous 

Sf

noun
  • a book size one sixty-fourth of the size of a standard uncut sheet of paper (less 7.5 cm (3") in height) 

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