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4. Put down the flexible board and make it support the back side of the frame.
In order to make sure each foam to stay on the inner side well please follow the
below steps
5. Take out one of foam and insert it, aligning it with the top surface.
6. take out a second foam and insert it, aligning it with the right side surface.
7. Take out the third foam and insert it, aligning it with the left side surface
8. Take our the fourth foam and lay it against the back side surface.
