This problem needs more test cases of squares not aligned with the main axis. And right kites.
Check if sorted
Matrix indexing with two vectors of indices
Count decimal digits of a number
Flip the vector from right to left
Say type of roots in quadratic equation
Ratio between sum of primer numbers and non-prime numbers
Ratio between sum of primes and sum of factors
Approximate the inverse tangent by power series
Get the mean digit
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