If length, breadth and height of the walls are given, find the area of the four walls.
In the test cases you wrote "your_fcn_name(x)" and not "your_fcn_name(l,b,h)" ;-)
Summing Digits within Text
The sum of the numbers in the vector
Evaluating a polynomial
Vectors counting by 2
Find the square of the sum of the digits of a number
Convert a number to its Roman representation
Concatenate two strings
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