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)" ;-)
Magic is simple (for beginners)
Swap two numbers
Square a Number
Concatenate two strings
Convert a number to its Roman representation
Create the following sequence : 0 1 1 4 9 25 64 169 ...
Reverse a matrix
Find the square of the sum of the digits of a number
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