Taking a look at the sheet music below, you can see that the dragadiddle #2 is just like the dragadiddle #1, but with one extra dragged 8th note right after the quarter note single on the dragadiddle #1. If you lose the drags on the dragadiddle #2, you can see that the dragadiddle #2 is basically an 8th note double stroke followed by a 16th note single paradiddle. The dragadiddle #2 naturally alternates within itself, as you can see below.
