Watch the Example 15 online guitar lesson by Brad Carlton from Guitar Lab: Boogie-Woogie

This example replaces the 3rd chord in ex 14 with a A C/A (Am7) which comes from A dorian. The 2nd chord is still Bm/A but could be viewed as coming from A mixolydian or A dorian. Compare this example with example 7. Again we have just changed the inversion of the chords.