Find the alphabetic word product
Replace NaNs with the number that appears to its left in the row.
MATCH THE STRINGS (2 CHAR) very easy
Sum the numbers on the main diagonal
Create a matrix X, where each column is a shifted copy of the vector v
vectorization in N
Matrix which contains the values of an other matrix A at the given locations.
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
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