Blues Shuffle

your index and thumb, use the pick 
and your middle finger

4 Times (I)
e---------------------------------
B---------------------------------
G-----------4---2--1--------------
D---------------------------------
A--2-2------5---4--2--------------
E--0-0-3-4----0-------------------

2 times  (IV)
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e----------5---3--2---------------
B---------------------------------
G----------5---4--2---------------
D-2-2--------0--------------------
A-0-0-3-4-------------------------
E---------------------------------

Back to (I twice)then;

2 times  (V)
e---------------------------------
B-----------7----5--5-------------
G---------------------------------
D--4-4------7----6--5-------------
A--2-2-5-6------------------------
E--------------7------------------

Back to (IV twice) then (I twice) 
then the turnaround
e-----2-----| 
B-----0-----| 
G-----2-----| 
D-----1-----| 
A-0-1-2-----| 
E-----------| 

Then start the progression over 
again