inlay vs work in

inlay

verb
  • To place (pieces of a foreign material) within another material to form a decorative design. 

  • To place an inlay in a tooth. 

noun
  • The material placed within a different material in the form of a decoration. 

  • A filling for a tooth, made of ceramic or gold to fit the cavity and shape of tooth and cemented into place. 

  • The piece of paper or the booklet inside the case of a compact disc, DVD, or cassette. 

work in

verb
  • Used other than figuratively or idiomatically: see work, in. 

  • To find time or space for, amid other things. 

  • To work out using a machine in between the sets of someone who is already using that machine. 

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