pen in vs surround

pen in

verb
  • To enclose (animals) in a pen. 

  • To schedule; fix a date for. 

  • To cause to be stuck in a situation; to be forced into a situation by circumstances. 

surround

verb
  • To enclose or confine something on all sides so as to prevent escape. 

  • To encircle something or simultaneously extend in all directions. 

noun
  • Anything, such as a fence or border, that surrounds something. 

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