scarce vs second string

scarce

adj
  • Uncommon, rare; difficult to find; insufficient to meet a demand. 

second string

adj
  • Not as good; of a lower quality or condition. 

noun
  • A unit of players which is considered to have a secondary level of talent and which usually plays after the first string. 

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