It seems like the test cases in section 2B are not right.
Summing Digits within Text
Prime factor digits
Fletcher-Reeves Conjugate Gradient Method
Decode a simplified barcode
Expand 10^n to Powers of 4
Toads and Frogs Puzzle
Response of First Order Control Systems
Let's Make A Deal: The Player's Dilemma 2
The Generalized-N Eggs Problem
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