I definitely have to sleep.

It's already past twelve half.

Tomorrow, I have to wake up at 6AM.

However, this "easiness" prevent one from conceptually understanding "what's going on?"

Yes, the tree method is pretty mechanical one and easy to use.

We've started discussing the truth tree method in the logic class. I feel more and more students cannot keep up with the class.

@eien_kozo Yeah, there is a bunch of logs. But, almost all of them are really short and therefore, it might not take so much time to read.