Given vector x, calculate the alternating sum
y = x(1) - x(2) + x(3) - x(4) + ...
Get the area codes from a list of phone numbers
"Low : High - Low : High - Turn around " -- Create a subindices vector
Find a subset that divides the vector into equal halves
The Answer to Life, the Universe, and Everything
Produce a cosine wave
Evaluating continued fractions
Leap years on other planets
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