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There are different opinions on whether having had any forbidden relationship forbids one from marrying a kohen or is it dependent on which type of forbidden relationship. In the last part of the Mishna, Rabbi Eliezer ruled that only a definite mamzer can marry a definite mamzer but if the status is one of doubt, they cannot marry a mamzer or another person whose lineage is in doubt. Rav holds by this opinion but Shmuel does not. This seems to contradict a different debate between Rav and Shmuel regarding an engaged woman whose child's father is unknown. Various explanations are brought to resolve the contradiction.Rabbi Eleazar ruled that a cuti can't marry a cutit. Several explanations are brought to understand this ruling.