Take the first string input, reverse the order of the string from the end to beginning (i.e. apple becomes elppa), add a space and concatenate it to the second inputted string.
Additional test cases have been added.
Remove the two elements next to NaN value
Multiply by 3
Convert yards to feet
Sum two matrices
Simple String Concatenation
Matrix Ax=B problem
Find the index of the lowest number in a matrix
Matrix Generation from Vector Multiplication
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