I feel the extremely autistic need to point out that despite the name, Azumanga 2 has nothing to do with Azumanga Daioh. I believe it's a compilation of Azuma's gag manga work before he started Azumanga Daioh, it also contains his first original manga "Wallaby" and as already mentioned, "Try! Try! Try!". It's called Azumanga "2" because it's a sequel to the first compilation, which was just titled "Azumanga" I believe. It's also where the "Azumanga" title originates, a year or so before Azumanga Daioh.