No copyrighted books that have been translated in English are available. The project to create such books is called ``Project Sugita Genpaku [35]''. We obtained Japanese texts and translated English texts. Unfortunately we can not obtain a Japanese sentence using an English sentence. Therefore, we could not extract Japanese-English parallel sentence from this corpus. However, this project has been very interesting.
We have heard that many translated patent texts are available in English. Sentences from these texts may enhance our future database.