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All the advice:
1) Iterate with enumerate instead or range(len(x))
2) Use list comprehension instead of raw for loops
3) Sort complex iterables with sorted()
4) Store unique values with sets
5) Save memory with generators
6) Set default values in dictionaries with .get() and .setdefault()
7) Count hashable objects with collections.Counter
8) Format strings with f-Strings (Python 3.6)
9) Concatenate strings with .join()
10) Merge dictionaries with {**d1, **d2} (Python 3.5)
11) Simplify if statements with if x in the list
List comprehension tutorial: https://youtu.be/RaIu2-NM0t0
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