Rear Board Assembly
Align the B pin holes of Rear Board (part D) and Bottom Frame (part A),
then secure them with 2 B Pins (part VI). And then align the holes on the
upper side of the 3 boards,put 2 L Handles (part IV) into secure the boards
and then secure L Handles with 2 small B Pins of L Handle Set (part IV) .
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