Estimates of the total number of Chinese words and lexicalized phrases vary greatly. The "Hanyu Da Zidian", a compendium of Chinese characters, includes 54,678 head entries for characters, including bone oracle versions. The "Zhonghua Zihai" (1994) contains 85,568 head entries for character definitions, and is the largest reference work based purely on character and its literary variants. The CC-CEDICT project (2010) contains 97,404 contemporary entries including idioms, technology terms and names of political figures, businesses and products. The 2009 version of the Webster's Digital Chinese Dictionary (WDCD), based on CC-CEDICT, contains over 84,000 entries.