scarce vs third string

scarce

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

third string

adj
  • Of a decidedly lower quality or condition. 

noun
  • A unit of players that plays behind the first and second strings; a junior varsity team. 

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