[If there is] a doubt whether one ate cheilev fat or did not eat [it]; or even if he ate [it], [if] there is [still] a doubt whether it contained the amount [required for a chatas], or whether it did not; if cheilev fat and permissible fat were before him, and he ate one of them, but it is not known which of them he ate; [or] if his wife and his sister were with him in the house, and he inadvertently cohabited with one of them, but it was not known with which one of them he inadvertently cohabited; [or] if it was either the Sabbath or a weekday and he performed labor on one of them, but it is not known on which day he did it, he must bring an asham talui.