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To perform a finger percussion, also known as a finger roll, follow these steps:

1. Curl your index finger inwards so that the tip is touching the base of the finger near the knuckle.

2. Extend your middle finger and use its tip to flick the curl of your index finger outwards, sending it upwards in a controlled motion.

3. As your index finger is about to return to its original position, curl it back inwards again.

4. Now, use the tip of your middle finger to make contact with the curl of your index finger, propelling it upwards in the same manner.

5. Continue this process with each finger of your hand, moving from index to middle to ring finger, and finally the little finger.

6. After reaching the little finger, you would then move on to the thumb, reversing the order and moving from the thumb back to the index finger