Given four coordinates, write a function to check if they form a square on the XY plane.
Select every other element of a vector
Summing Digits within Text
matrix of natural number
The sum of the numbers in the vector
Ratio between sum of primes and sum of factors
Approximate the inverse tangent by power series
Alternating 1´s and 0´s in a matrix
Alternate list of elements
Ratio between sum of primer numbers and non-prime numbers
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