formula vs stencil

formula

noun
  • A symbolic expression of the structure of a compound. 

  • Any mathematical rule expressed symbolically. 

  • A formal statement of doctrine. 

  • A formulation; a prescription; a mixture or solution made in a prescribed manner; the identity and quantities of ingredients of such a mixture. 

  • A syntactic expression of a proposition, built up from quantifiers, logical connectives, variables, relation and operation symbols, and, depending on the type of logic, possibly other operators such as modal, temporal, deontic or epistemic ones. 

  • A plan or method for dealing with a problem or for achieving a result. 

stencil

noun
  • A pattern produced using such a utensil. 

  • A two-ply master sheet for use with a mimeograph. 

  • A thin sheet, either perforated or using some other technique, with which a pattern may be produced upon a surface; a utensil that contains a perforated sheet. 

verb
  • To print with a stencil. 

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