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RE: 📚 Let's Memorize the Conversion Factors in your FX-991 ES PLUS Calculator!
Haha! At first, it's difficult to understand, but when you master the system; believe it or not it's amazing! Our brain is powerful. :)
Even in person I cannot understand it if you discuss in my front. I'd rather be sleeping friend. Hehehe
Hahaha. It's really hard to understand the system friend.