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1.3.55 दाणश्चसाचेच्चतुर्थ्यर्थे

If तृतीया is used in the sense of चतुर्थी referred by दाण् after सम्, then too आत्मनेपद results. For example, दास्या रतिं संयच्छते (तृतीया is improper here, hence आत्मनेपद).