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"Congratulations on the victory, teacher Ning. That was an excellent display of knowledge," Keng said as he shook Ning's hand.

"Thank you, teacher Keng. You really helped me too. If you weren't here, I can't imagine how many of my facts would've been dismissed as impossible," Ning said. 

"Haha, I'm happy that this old man's years of obsession became of some use to you," Keng said. "By the way, teacher Ning, where did you learn all of this information about the beasts? You don't look that old to me."

"I don't know what to say, Senior Keng. I got this information from a friend in exchange for all of my information on alchemy. I have been reading these for a hundred years or so," Ning said. 

"I see," Keng said, sort of satisfied with the answer. 

The students and teachers watching the duel started dispersing. 

"Let's go. No need to keep listening to the liar," the teacher in green said and left.