It looks like the creation of the word got messed up in the creation of the course. There should be two separate words nay. And while they both should have all the same alternative translations, the best translation should be different for the two. However, it seems they got combined in the system and there is only one word nay in the system and it is trying to be both words at once. I can't find any way to tell it to only be one of the words. It insists on being both or neither. It still appears in some sentences (meaning only "to marry"), but it no longer appears as a single word exercise.