http://jplang.tufs.ac.jp/en/ka/1/1.html
http://www.jlpt.jp/samples/forlearners.html
http://study.u-biq.org/english.html
http://www.transbureau.com/foreigners/lesson1.html
https://www.coscom.co.jp/hiragana-katakana/kanatable-j.html
http://trans.hiragana.jp/ruby/http://www.asahi.com/national/?ref=com_gnavi
http://www.jlpt.jp/samples/n3.html