middleAsColumn: Return all but first and last element as a column vector
Doubling elements in a vector
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Generate a random matrix A of (1,-1)
Swap two numbers
Knights and Knaves (part 2)
Five steps to enlightenment
singularity 2.0 (easier)
Clockwise or Counterclockwise
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