Knowing that 123-45-67+89=100, write a function that gives this result for any order of the digits in the input. Otherwise, the function should give 'NaN'.
Construct a string from letters and counts
Matrix with different incremental runs
Return the first and last character of a string
Find the biggest empty box
Add 3 numbers
Get the mean digit
Approximate the inverse tangent by power series
Ratio between sum of primer numbers and non-prime numbers
Alternating 1´s and 0´s in a matrix
Check if is a square
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