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DS-1000 / 102 / In pandas, how do I replace &AMP; with '&' from all columns where &AMP could be…

Problem

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Problem:
In pandas, how do I replace &AMP; with '&' from all columns where &AMP could be in any position in a string?
For example, in column Title if there is a value 'Good &AMP; bad', how do I replace it with 'Good & bad'?


A:
<code>
import pandas as pd

example_df = pd.DataFrame({'A': ['Good &AMP; bad', 'BB', 'CC', 'DD', 'Good &AMP; bad'], 'B': range(5), 'C': ['Good &AMP; bad'] * 5})
def f(df=example_df):
    # return the solution in this function
    # result = f(df)
    ### BEGIN SOLUTION

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Source and history

upstream_id / Original problem ID: 102
task_id: 943ba764-7430-5f41-a118-c494f45dc9fe
task_key: default--test--102
task_revision_id: 2
config / split: default / test

Official source

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