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Select every other element of a vector
Get the area codes from a list of phone numbers
Vectorize the digits of an Integer
07 - Common functions and indexing 4
Flip the vector from right to left
If the number is Narcissistic number
Seperate array to small section according to its index position
Repeat copies of array elements
Compute the intersect point of line and plan
Find the right number make the equation
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