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.
Find the numeric mean of the prime numbers in a matrix.
Which doors are open?
Rotate a Matrix by 90 degrees
Vector indexing: lower than mean
Vector Element Multiplication
String Delimination and Outputting
Check if inputted variable is a string or a number
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