Find common elements in matrix rows
Get the area codes from a list of phone numbers
Matrix indexing with two vectors of indices
Set the array elements whose value is 13 to 0
Create a vector whose elements depend on the previous element
Replace NaNs with the number that appears to its left in the row.
Find the peak 3n+1 sequence value
Find state names that start with the letter N
Find all elements less than 0 or greater than 10 and replace them with NaN
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