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)" ;-)
Find all elements less than 0 or greater than 10 and replace them with NaN
Test if two numbers have the same digits
Create a vector
Concatenate two strings
Convert a number to its Roman representation
Reverse a matrix
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