Additional test cases have been added.
liuliu:you "regexp" everything,everywhere? LOL
Find common elements in matrix rows
Create a square matrix of multiples
Replicate elements in vectors
Given a matrix, swap the 2nd & 3rd columns
Find the product of a Vector
Compute the intersect point of line and plan
Determine if input is a Narcissistic number
Find the right number make the equation
Successive zeros (harder)
Generate a vector like 1,2,2,3,3,3,4,4,4,4
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