leading edge vs usual

leading edge

noun
  • The foremost part of a trend etc; a vanguard 

  • At the forefront of practice or technology, contrast with bleeding edge 

  • The frontmost edge of a wing or other airfoil of an aircraft; sometimes contains slots or slats 

usual

noun
  • The typical state of something, or something that is typical. 

  • A specific good or service (e.g. a drink) that someone typically orders. 

adj
  • Most commonly occurring; typical. 

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