This is cheating.
it's not, this is a direct and clever solution to the specified problem which would not work for other arbitrary Cody problems, hence not cheating (in my book)
Word Counting and Indexing
Solve the Sudoku Row
Determine Whether an array is empty
Relative points in 2D: problem 2
Homogeneous lines and points in 2D: problem 1
Composing relative poses in 2D: problem 2
Twists in 2D
Determine roll pitch yaw angles from a 3D rotation matrix
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