piece together vs piecen

piece together

verb
  • To physically assemble (or reassemble) from fragments or pieces. 

  • To reconstruct an event or goal from incomplete or flawed elements. 

piecen

verb
  • To join broken threads or ends in spinning. 

  • To extend by adding a part or parts. 

  • To join; piece (together); fay. 

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