Input(s) - any string
Output(n) - number of digits within string s
Additional test cases have been added.
Return a list sorted by number of occurrences
Swap the input arguments
Getting logical indexes
Remove the two elements next to NaN value
Determine the length of a string of characters
Create matrix with Gray code
Vector of numbers divisible by 3
Mean and standard deviation of times in string
Number of odd and even elements within matrix
Return area of square
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