Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Connect Four Win Checker
radius of a spherical planet
Arrange Vector in descending order
Whether the input is vector?
Sum of odd numbers in a matrix
Count unique orderings of vertices of a polygon
Identify full reptend primes
Investigate the frequency of last digits of prime numbers
Identify Ruth-Aaron numbers
Solve an ODE: equation B
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