Return the 3n+1 sequence for n
Find best placement for ordered dominoes (harder)
Return the first and last character of a string
multiply by three
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
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
vectorization in N
Find the elements of a matrix according to a defined property.
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