decipher vs unfold

decipher

verb
  • To find a solution to a problem. 

  • To decode or decrypt a code or cipher to plain text. 

  • To make sense of a complex situation. 

  • To read text that is almost illegible or obscure 

noun
  • A decipherment; a decoding. 

unfold

verb
  • To turn out; to happen; to develop. 

  • To undo a folding. 

  • To release from a fold or pen. 

  • To open (anything covered or closed); to lay open to view or contemplation; to bring out in all the details, or by successive development. 

  • To reveal. 

noun
  • In functional programming, a kind of higher-order function that is the opposite of a fold. 

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