Task: Question Answering
Input (English): As a raw corpus, we used a Japanese web corpus that was compiled through the procedures proposed by BIBREF13.  From the corpus of about 100 million sentences, we obtained 1.4 millions event pairs for AL, 41 millions for CA, and 6 millions for CO. 
 Question: How large is raw corpus used for training?
Output (English): 100 million sentences