could take several hours and still stump him. That wasn't impossible.But in yesterday's exam, the most difficult problem only stumped him for fifteen minutes before he found a breakthrough. This natur...." Ru Sio pointed at her own wardrobe."I have many clothes too. I can just wear this one for now; anyway, I won't want to wear it after a short while, and that would be wasteful, isn't waste shameful"...