i am not very good at exo. btw i acciently bought an extra OS text and i will give it to u later.

tho it's so OS, i didnt even read mine and i have 2 copies!

跟資訊室混太熟，看到OS想到作業系統。

Thanks Jenny. But how come you have two copy?

Haha... Hedge Papa. OS in our language means Oral Surgery.

i swear i only hit it once on amazon...maybe i accidently hit it twice and stupidly enough i didnt notice

ouch..... that's the problem with buying on line right? Ok... I will buy one from you anyway. I need it anyway