http://pragprog.com/book/btlang/seven-languages-in-seven-weeks の課題
http://www.simple-play.com/category/seven-languages-in-seven-weeks/
http://pragprog.com/book/btlang/seven-languages-in-seven-weeks の課題
http://www.simple-play.com/category/seven-languages-in-seven-weeks/