Seats at the library are hard to find

First, of course, you want one with a desk, because you want to study, not just read.

Next, you avoid those next to the library offices to avoid the noise.

Then you want one next to a power outlet so you can listen to music without using the battery; leaving you with about 30% of choices.

Sometime you want a spot with a strong WIFI signal for web access. However, this is not important.

Last, you want to avoid the noisily chating, hugging and kissing couples. But avoiding these couples leaves you only 10% of choices.

With the power outlet & kissing couple avoidance rules, I get about 10*30=3% of the seats to choice from~ and most of those are usually taken.