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the purported author of the nancy drew mystery series , `` carolyn keene '' , is actually a pseudonym for a series of ghostwriters who write books in the same style using a template of basic information about the book 's characters and their fictional universe .
 product producer: ghostwriters, books
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
Answer:
 product producer: ghostwriters, books