१.१.५९ प्रत्ययस्यलुक्श्लुलुपः

Still on the subject of अदर्शनं लोपः the sutra describes the three types of अदर्शन - लुक् श्लु लुप्. The instances of अदर्शन are named after respective instances i.e. An अदर्शन caused by लुक् would be considered लुक्based अदर्शन etc.

Taking विशाख as an example,
विशाखायां जातः - विशाखा ङ्इ अण् - विशाखा अण् - विशाखा (४.३.३४*)
Here लुक् occurred for अण् and would occur for टाप् as well.

विशाख - विशाख:

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*4.3.34 श्रविष्ठाफल्गुन्यनुराधास्वातितिष्यपुनर्वसुहस्तविशाखाषाढाबहुलाल् लुक् defines लुक्activity for respective words. फल्गुनी would have ट and श्रविष्ठा would have छण् etc.

फल्गुन्यां जाता - फल्गुनी ट - फल्गुनी अ - फल्गुनी ङ्ईप - फल्गुनी (द्विगु समास as described in 2.1.2.2 )
श्रविष्ठा, अषाढा - छण्