Watch the Double the Mileage online guitar lesson by Brad Carlton from Chord Studies: Double-Stops Vol. 1
Here we're simply inverting what we learned in Example 13, "Dorian Defined". In Example 13, we had thirds and now we invert them to sixths. Try playing this and "Dorian Defined" back to back and notice how we can get double the mileage from the same chords, just by inverting our thirds to sixths.