This riff predominantly consists of three notes, F#, E and A. Still keeping with our shuffle-feel, the note groupings offer a polymetric sound that extends four bars. In bar 36, the meter resets resulting in a "speeding up" effect that helps the riff along to its conclusion.
Keep an eye on the mutes located before each group of 4, as the snare beat is accented by this note, and your timing will be relatively dependant around it.