Feng and All, I used the screen shot to contain my writing is easier for me.when I use iPad typing ,iPad changed my spelling from in to I and many more others I am not a fast typist. Another thing ,when I type to reply to you, I have to move to the top of the page to read your writing and move down to continue answering you. In screen shot, I read your writing in iPad and write my discussion on paper without referring up and down off the page. I want to discuss with you with all good points.it may take many postings.likewise. I want to discuss with others the same way. I may not have time to do it in one shot and right away. In pinyin arrangement,there are too many characters with the same sound.as you said 400 sounds for all those thousands of single characters. Also there are 同音词 to make pinyin to become a pinyin language difficult. Pinyin is really for 注音 only for now. Til next time.