There are quite a few double stroke rudiment exercises in the 40 official drum rudiments, but none of these are in them. While the ’40 drum rudiments’ cover many of a drummers needs, in terms of practicing, there are many more double stroke exercises that are useful to learn.
The 10 rudiment – style snare drum exercises here are all involving double strokes. These snare drum exercises are all rhythms that I use quite often in my drumming, so to me they are quite essential I believe.
When learning rudiments, I was always taught that they are preparing you for possible eventualities in drumming – for example by learning and practicing the flam with different leading hands, you have prepared for using it in drum fills in songs, in a variety of situations. So to me, all of these 10 rudiment exercises are essential patterns that you will need at some point as a drummer, so to master these, will be beneficial to you for when you meet the patterns elsewhere.