flash in the pan vs permanent

flash in the pan

noun
  • A career notable for early success not followed by significant accomplishment. 

  • A transient occurrence with no long-term effect. 

permanent

noun
  • A card whose effects persist beyond the turn on which it is played. 

  • A chemical hair treatment imparting or removing curliness, whose effects typically last for a period of weeks; a perm. 

  • Given an n⨯n matrix a_ij,, the sum over all permutations 𝜋, of ∏ᵢ₌₁ⁿa_i𝜋(i). 

adj
  • Without end, eternal. 

  • Lasting for an indefinitely long time. 

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