Pig vs Snake

Pig

name
  • The twelfth of the 12-year cycle of animals which appear in the Chinese zodiac related to the Chinese calendar. 

Snake

name
  • The sixth of the 12-year cycle of animals which appear in the Chinese zodiac related to the Chinese calendar. 

  • A surname. 

  • A river in the northwestern United States, tributary to the Columbia 

  • An early computer game, later popular on mobile phones, in which the player attempts to manoeuvre a perpetually growing snake so as to collect food items and avoid colliding with walls or the snake's tail. 

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