المرحلة الاولى/الرياضيات/المحاضرة الرابعة(اعادة)

Round-13 hunt: picked; source: named-course long-video search (round-12 queries, single-hit channels, second prefilter); channel screens (sellers/exam/re-upload/devotional/vendor/events), provenance check, vendor/seller/devotional recheck and quality tier A passed; strict per-title check + final strict pass; oEmbed verified.