In the 3rd lesson HOW TO PICK INDIVIDUAL STRINGS WHILE STRUMMING, there is either a B missing in the text or a movement I am not familiar with. 
THE BEST EXERCISES
For the following exercises, we keep returning back to the bass note of the chord we’re playing. This is very important in this technique, and you’ll use it in different ways. Great examples are when you’re alternating ass parts or when you want to pick out the bass note of a chord individually.
Does refer to the “bottom” strings ? 
One for the mods to resolve.
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