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DS-1000 / 169 / I have a dataFrame with rows and columns that sum to 0.
Problem
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Problem:
I have a dataFrame with rows and columns that sum to 0.
A B C D
0 1 1 0 1
1 0 0 0 0
2 1 0 0 1
3 0 1 0 0
4 1 1 0 1
The end result should be
A B D
0 1 1 1
2 1 0 1
3 0 1 0
4 1 1 1
Notice the rows and columns that only had zeros have been removed.
A:
<code>
import pandas as pd
df = pd.DataFrame([[1,1,0,1],[0,0,0,0],[1,0,0,1],[0,1,0,0],[1,1,0,1]],columns=['A','B','C','D'])
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>
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