Double fold

[ale_castano]

Hi everyone, 

I need to make an animation of a plane bending twice, attached is a video of what it should look like.
I can fold the first part, but the second fold should happen at the same time as the other, and this creates problems.
What do you think would be the best solution?
Thank you very much to anyone who can help me out.

https://youtu.be/NLjXYXW_Zw4

[dmitriy.shpilevoy]

3 bones should do the trick.