The Seventh Solution to a Function

When the second year of high school started, Lin Ran and Li Xiao became tablemates. One is a stubborn girl with outstanding talent in geography but middling in physics; One is a genius boy who knows mathematics and physics at his fingertips and can always come up with a third solution. They were supposed to be just study partners: he taught her force analysis, she taught him monsoon circulation. Until one autumn evening, Lin Ran wrote a poem about rain on the back of the draft paper. And Li Xiao took out a dark cyan pen from his pen bag—— "I also write poetry." He said, his ears slightly red. Therefore, between the function image and the contour line, Between the New Year's bells in the library and the first snowfall in winter, Witnessed by a ginger kitten who shows up on time every Friday, The two souls began to talk in a third language: He writes love poems using the laws of physics, while she hides her thoughts in climate distribution; He calculates the optimal balance point on the back of a bicycle, and she records the latitude and longitude of every sunset; They drew a coordinate system on the mist on the glass window, with the origin marking the day they met. But youth is a proof question with no standard answer—— When the emotional input variable exceeds the definition domain of all formulas, When the collection of "tablemates" begins to collapse toward "us", Only then did they discover: Some functions have a seventh solution, There are some poems where you don't have to finish the last line. And the kitten named "Cookie", Waiting for a forever home.