CBroz1

"""Coding challenge: Serial numbers | Chris Brozdowski, January 28th 2023

Goal: Create N serial numbers given N and a list of valid characters for each position 
    in the resulting serial. 

Assumptions:
    1. Each item in the list will be a string.
    2. If a provided string is empty, there are no valid characters for this position. 
        Output should exclude this position.
    3. If N exceeds the number of unique serials, only report unique serials.

CBroz1

import copy
import itertools
import operator
import os
import pickle
from collections import namedtuple

import matplotlib
import matplotlib.pyplot as plt
import numpy as np