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import pandas as pd
left = pd.DataFrame({
'key':['K0','K1','K2','K3'],
'A':['A0','A1','A2','A3'],
'B':['B0','B1','B2','B3']})
right = pd.DataFrame({
'key':['K0','K1','K2','K3'],
'C':['C0','C1'
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