observe vs take in

observe

verb
  • To notice or view, especially carefully or with attention to detail. 

  • To take note of and celebrate (a holiday or similar occurrence); to follow (a type of time or calendar reckoning). 

  • To comment on something; to make an observation. 

  • To follow or obey the custom, practice, or rules (especially of a religion). 

take in

verb
  • To absorb or comprehend. 

  • To allow a person or an animal to live in one's home. 

  • To receive (goods) into one's home for the purpose of processing for a fee. 

  • To enjoy or appreciate. 

  • To deceive; to hoodwink. 

  • To tighten (a belaying rope). (Also take up.) 

  • To shorten (a garment) or make it smaller. 

  • To attend a showing of. 

  • To reef. 

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