Wooden Puzzle: Four T

The puzzle before you contains 4 pieces.

Take the pieces out, and overturn the frame,

On the other side of the frame you'll find another frame.

Try to insert all four parts into the other frame.

Be aware that this is a 2D puzzle, and once inside all the parts are flat.  

Age: 8+

Level: 3

Weight: 211 gm

Size: 120*120*30 mm