How to check one rows value present in any of the other column row value

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I have excel like below

A B
1A 100 
2A  1A 
3A  101
5A  1A

Expected out is

A B   Bool
1A 100  
2A  1A  True
3A  101 
5A  1A   True

Here you can see that 1A present in df['A'] is present in df['B]

I tried like

import pandas as pd
df = pdf.read_excel('test.xlsx')
df['A'].isin(df['B'])

but its not working



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