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I believe the Pesakh Langsam yDNA lienage is J-FGC65704. Please see here for more details: https://www.geni.com/documents/view/6000000072391855387?doc_id=6000000158337910049
This is an index of rabbnical yDNA kept in the yDNA Rabbinical Lineages Project: https://www.geni.com/projects/Rabbinical-Lineages-yDNA-and-Haplogroup-Identification/58725 Cordially, Adam Cherson
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