Get the area codes from a list of phone numbers
Number of 1s in the Binary Representation of a Number
Find best placement for ordered dominoes (harder)
Put two time series onto the same time basis
Find the elements of a matrix according to a defined property.
Duplicate each element of a vector.
vectorization in N
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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