«رَأَيْتُ اللَّتَيْنِ فَازَتَا» — I saw the two women who succeeded.
«مَرَرْتُ بِاللَّتَيْنِ فَازَتَا» — I passed by the two women who succeeded.
The first relative is accusative and the second genitive, both marked by yāʾ. «فَازَتَا» is the ṣilah; its dual suffix is subject and ʿāʾid.