Double spitting 
Double spitting is developed on the base of single spitting. Double spitting is faster than single spitting and fit for the rhythm of semiquaver. The sign in numbered musical notation is ¡°T K¡±. You can say ¡°too cool¡±. The sound ¡°too¡± is phonated by the tip of tongue and the sound ¡°cool¡± is phonated by the root of tongue. At the beginning, you can repeat ¡°too cool¡± rapidly. Then you can use your tongue when you play the hulusi. 
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Tri-spitting
Tri-spitting is composed by a single spitting and a double spitting. The method of practice is same to that of single and double spitting. The forms are showed below.
[TOO     TOO  COOL ,    TOO   TOO  COOL ]    
[TOO COOL   TOO    ,    TOO  COOL  TOO ]
[TOO COOL TOO  ,        TOO   COOL  TOO  ]
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