hedge in vs pen in

hedge in

verb
  • To limit or constrain (someone). 

  • To enclose or surround something with a hedge, trees or other plant life. 

pen in

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

  • To enclose (animals) in a pen. 

  • To schedule; fix a date for. 

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