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Good old rhythm guitar in A.
Probably one of the most frequently used patterns ever...

Add an octave on top for a fuller sound.
Another favourite key, G this time. Chord sequence is G, G, C, G, D, (G).
Rock, rockabilly, country, blues, it works anywhere. Now in G. Chords: G, C, D, (G).
No open strings, so this one you can easily move to any key. Use 1st, 3rd and 4th finger on your left hand.
A very effective lead part for the above pattern. I´ve added the rhythm guitar as well.