r10 vs r11
... ...
13 13
=== 수학 ===
14 14
* [[48÷2(9+3)]]
15 15
* 0.999...가 어떡개 1이죠??
16
* the proof is easy and left as an exercise.
17 17
18 18
=== 음악 ===
19 19
* 반키만 올려줘
... ...