Given three integers x, y and d, return x/y (as a string) to d significant digits. Remove leading and trailing zeros.
x = 11; y = 7; d = 10;
z = adiv(x,y,d)
Remove all the words that end with "ain"
Wind outward from the center ...
Determine Whether an array is empty
Add two numbers
Create an 'arrow-head" matrix
Count up then down
Apply a function array to an array of numbers
Replace multiples of 5 with NaN
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