Omit columns averages from a matrix
Construct a string from letters and counts
Largest Twin Primes
Number of digits in an integer
Volume and area of a sphere
Find the "ordinary" or Euclidean distance between A and Z
How many days does the cat take to climb out of the hole?
Is this matrix orthogonal?
Pythagorean perfect squares: find the square of the hypotenuse and the length of the other side
Flip the main diagonal of a matrix
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