Convert the input sentence to upper case and replace all vowels with an underscore ('_')
Back and Forth Rows
Specific Element Count
Penny flipping - calculate winning probability (easy)
Let's get back to school, and create multiplication tables
Divisible by 5
Day counter function
Calculating the total earnings of a factory
Check if there are white spaces in the input string
Basics: counting digits of a number irrespective of the sign
Nth root of a number
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