Interesting scenario! I have several questions: - What specific problem are you trying to solve with the 'tableau' framework? Is [it](https://www.nairobihospital.org/) a math or data sorting problem? - In "Problem 1" is there a reason why you chose exactly the permutations [1, 2, 3, 4]? Is it about homework? - What ordering rules are required for the 'isValid' method? Are they based on the homework instructions? Also wondering if there are certain cases or inputs that you expect this code to handle in a certain way?