Get the area codes from a list of phone numbers
Calculate the Levenshtein distance between two strings
peta to nano (x-ray)
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
A quadrant matrix
First non-zero element in each column
Matrix which contains the values of an other matrix A at the given locations.
Create a matrix X, where each column is a shifted copy of the vector v
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