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# defaultdict Examples
# Using list as the default_factory, it is easy to group a sequence of key-value pairs into a dictionary of lists:

s = [('yellow', 1), ('blue', 2), ('yellow', 3), ('blue', 4), ('red', 1)]
d = defaultdict(list)
for k, v in s:
    d[k].append(v)

sorted(d.items())