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Hello, I would like to add a new function to SageMath. Its function consists of creating a three-dimensional Cartesian product on 3D plots. However, I am a beginner and don't understand how to contribute. I tried reading the tutorial on the SageMath website, and it says I need to create a pull request on GitHub. However, GitHub requires comparing two branches, and I don't know which branches I need to compare. If someone could help me, I would really appreciate it.