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DS-1000 / 103 / In pandas, how do I replace &AMP;,&LT;,&GT; with '&''<''>' from all columns…

Problem

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Problem:
In pandas, how do I replace &AMP;,&LT;,&GT; 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


df = pd.DataFrame({'A': ['Good &AMP; bad', 'BB', 'CC', 'DD', 'Good &LT; bad'], 'B': range(5), 'C': ['Good &GT; bad'] * 5})
</code>
df = ... # put solution in this variable
BEGIN SOLUTION
<code>

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upstream_id / Original problem ID: 103
task_id: 77fd0d21-3a04-5de0-a6a6-e9f1d45a7efb
task_key: default--test--103
task_revision_id: 2
config / split: default / test

Official source

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