Any list, no matter whether it is intended to or not, implies a hierarchy. People generally seem to feel that things closer to the beginning of any list have a higher priority. George Lawrence Stone's classic "Stick Control For The Snare Drummer" is easily the most widely used rudimental book. It is also essentially a list of sticking combinations, or as Stone refers to them, "Single Beat Combinations". That means that the section of the book with the highest priority, the first column, has become particularly important to many drummers practice routines.
Readers of this blog know that my personal favorite of the many fantastic methods using this first column comes from Alan Dawson, in John Ramsay's book "The Drummers Complete Vocabulary". In a nutshell, this Dawson's method involves alternating between a line from the first column of "Stick Control" and groups of four, then eight, then sixteen notes on a hand. Using this method means that your hands get very familiar with the first column of "Stick Control".
Something is missing
Recently while warming up with Dawson's method, I suddenly realized that something important was missing from the sequence in the first column of "Stick Control". Having memorized this column years ago, it had been quite a while since I actually looked at the page, but when I opened the book it turned out that my sense that something was missing was correct.
My initial feeling that skipping over these inverted double strokes didn't really make sense was reinforced by the fact that Stone goes through all four inversions of the Paradiddle in the first column. Going through the Paradiddle inversions makes perfect sense, but then why skip the double stroke inversions?