We asked Mr.Ryu a simple question.
"Japanese use Hiragana and Kanji. So we can write something in Hiragana, instead of Kanji when we foget the Kanji. You use only Kanji and when you forget some Kanji, what do you do?" He said "we never forget Kanji because we use it every day!!" And so SS asked him, "Can you write a word 'ken' in Old style Kanji, 'ken' as in 'Sekken' ?" "Of course! I can write it ....Oh?" Mr.Ryu couldn't do it!! He smiled and said "I never use this Kanji in my daily life. No problem."