tat katham ekadeśavṛttitvaniyatagrahaṇāgrahaṇādivibhāgo labhyata ity āha śrotraśabdāśrayāṇām ityādi
Then how does one obtain the distinction between grasping and non-grasping [of sound] that is determined by partial existence? [The author] states "śrotraśabdāśrayāṇām" etc.