БАК: разгаданные загадки и будущие вопросы - Д.А. Деркач

Round-13 hunt: picked; source: named-course long-video search; 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.