Reference for Bekhorot 13:41

זה וזה גורם אסור

Does this mean to say that R'Eliezer holds that a product of two [heterogeneous] factors is permitted<span class="x" onmousemove="('comment',' R. Eliezer who permits the offspring when the impregnation is from an unclean animal, because he maintains that since it is a product of combined causes and one of these, the mother, is a clean animal, it is permitted.');">²⁰</span>

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