A science student falls in love, so he tries to prove it. She folded thirty-seven pieces of paper to record the data, and he drew thirty-seven pictures to record the date. The horizontal axis was time, and the vertical axis was the name that he dared not say. Proving failure, but not accepting no solution. He said that the supplementary angle is not 0°, but ∞. The domain of definition has been rewritten since then.
