Additional test cases have been added.
nice way to learn about matrix concatenation
Find the numeric mean of the prime numbers in a matrix.
Find relatively common elements in matrix rows
Sum of the Matrix Elements
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Sum of series V
Sum of series VI
Sum of series III
Sum of series I
Sum of series VII
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