Watch the Three Note Groups Pt. 3 online guitar lesson by Brad Carlton from Guitar Lab: Speed, Precision & Endurance Vol. 2
This lesson will examine a three note layout involving a major second followed by a major second. This major second major second group occurs between the 1, 2, 3, the 4, 5, 6, and the 5, 6, 7 of the parent major scale of whatever mode you're in.