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        ammount = 11
        df = pd.DataFrame(
                data={'Close': [10,20,30,40,50,60,70,80,90,100,110], },
            index=pd.to_datetime([datetime(2023,3,d) for d in range(1, ammount+1)])
        )
        df2 = pd.DataFrame(
                data={'Open': [1000,2000,3000,4000,5000,6000,7000,8000,9000,10000,11000], },
            index=pd.to_datetime([datetime(2023,3,d) for d in range(1, ammount+1)])
        )
        
        df3 = pd.merge(df, df2, how='inner', left_index=True, right_index=True)
            Close   Open
2023-03-01     10   1000
2023-03-02     20   2000
2023-03-03     30   3000
2023-03-04     40   4000
2023-03-05     50   5000
2023-03-06     60   6000
2023-03-07     70   7000
2023-03-08     80   8000
2023-03-09     90   9000
2023-03-10    100  10000
2023-03-11    110  11000
2023-03-01    False
2023-03-02    False
2023-03-03    False
2023-03-04    False
2023-03-05    False
2023-03-06     True
2023-03-07     True
2023-03-08     True
2023-03-09     True
2023-03-10     True
2023-03-11     True
Name: Close, dtype: bool
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