Thanks for your kind answer. So, "You also know it" ( as you read). Anyway, good rhyme and very 
strong expression! It seems to me very rare that people major in computer science also good at r
hyme. Do you use similar kind of ----ah, what's the word---logic (not exactly the word, but my m
ind can't give me a better one) write programs? If you can't understand my English, never mind, 
I am still approving and learning. Sorry for my  胡言乱语! Best, Jue