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A dictionary is an unordered, mutable compound data type representing a set of (key, value) pairs, where each key may appear at most one time:

# Example: create 3 dicts with three key-value pairs:
# ('Na', 11), ('Mg', 12), and ('Al', 13)
d = dict((('Na', 11), ('Mg', 12), ('Al', 13)))
e = {'Na': 11, 'Mg': 12, 'Al': 13}
f = dict(Na=11, Mg=12, Al=13)
print(d == e == f) # check equivalence
print(d.keys()) # print all keys (unordered)
print(d.values()) # print all respective values
# Example: create a dict with two key-value pairs
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