Filling in the blanks, or in reverse, Adding the blanks

The full picking, practice this to learn the timing:
|--------------3------------3------------3--
|-------4----4--4----4----4--4----4----4--4-
|-----5--5----5--5-3--3----3--3-5--5----5--5
|------5--5-5-------5--5-5-------6--6-6-----
|----3------------3------------3------------
|-------------------------------------------

Then take away all but the following, being careful to 
preserve the timing
|-------------------------------------------
|-------------------------------------------
|-------------5--5---------3--3---------5--5
|------5--5-5-------5--5-5-------6--6-6-----
|----3------------3------------3------------
|-------------------------------------------

After enough practice, start with the second part, then 
play the first, it provides a sense of building a melody.