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(cardboard box, wood tray, 5 wood pieces, and wood keeper, 4.4" x 5" x 7/8")
Pieces are 3 units square; all notches and protrusions are 1 unit square. With the keeper removed, exchange pieces 1 and 2 and exchange pieces 3 and 4. Here is the start, every 7th move, and the final position of a 35 Rectilinear moves (75 Straight-Line moves, 256 unit moves) solution:
