[Python] mix two dataframes with every second row

I have two dataframes that I want to mix togther first two of the second table go to the every second two of, so like this:

First table Second table
column_1 column_1
1 5
2 6
3 7
4 8


And then the new table will be like this:

new table
column_1
1
2
5
6
3
4
7
8


Is there easy way to do this with pandas?

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