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File: //lib64/python3.8/collections/__pycache__/__init__.cpython-38.opt-1.pyc
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* ChainMap     dict-like class for creating a single view of multiple mappings
* Counter      dict subclass for counting hashable objects
* OrderedDict  dict subclass that remembers the order entries were added
* defaultdict  dict subclass that calls a factory function to supply missing values
* UserDict     wrapper around dictionary objects for easier dict subclassing
* UserList     wrapper around list objects for easier list subclassing
* UserString   wrapper around string objects for easier string subclassing

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    5
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    >>> d = Counter('simsalabim')       # make another counter
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    >>> c.clear()                       # empty the counter
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