This was given to a guitar student to introduce the idea of strumming a dotted 8th note followed by a 16th note. Beats 1 and 3 have consistent 16th notes being strummed to help lock in the proper rhythm/timing to make beats 2 and 4 easier. Beats 2 and 4 have the dotted 8th note + 16th note pattern.
Here is the Guitar Pro 6 tab for this lesson:
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John Taylor - guitar and bass instructor for Mile High Shred.