"Is it day or night?" If literally the only thing you know is the relationship between words, but you have a perfect knowledge of the relationship between word

"Is it day or night?" If literally the only thing you know is the relationship between words, but you have a perfect knowledge of the relationship between words, you'll quickly determine that "Day" and "Night" are both acceptable answers, and have no means of determining which is the right one. At the very minimum, you need a clock, and an understanding of the temporal nature of your training set, to get the right one.