Estimate a using inverse matrix calculation. This is principle of linear regression.
As a friendly reminder, we can see the test suite, so it makes the problem more challenging if the solution is not explicitly in the test suite.
The Test Suite needs to allow for floating-point errors in all test cases, as demonstrated in Solution 1575603. (Refer to Problem 44690.) Also, there should be at least four test cases for every problem.
Extract leading non-zero digit
Solve the Sudoku Row
Back to basics 8 - Matrix Diagonals
Find the logic
Solve the system of linear equations
Replace 0 to NaN!
Analyze observation data
Print true if
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