Bug: The order of the arguments in the starting function definition is x1, x2, y1, y2, whereas the the order in the test cases is x1, y1, x2, y2.
subtract central cross
The sum of individual numbers...
04 - Scalar Equations 3
07 - Common functions and indexing 1
Speed of light:Experiment
How many rectangles in a grid ?
Which way to go?
Number of divisors of a given number
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