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)" ;-)
middleAsColumn: Return all but first and last element as a column vector
Back to basics - mean of corner elements of a matrix
length of a vector
Convert a number to its Roman representation
Find the square of the sum of the digits of a number
Concatenate two strings
Reverse a matrix
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