Made by Interlocking Puzzles 2000.
(6.6 x 5.75 x 3.2 inch wood box with 42 wood pieces, each 3/4 x 3/4 x 2.25 inches)
35 distinct notchable 2 x 2 x 6 unit pieces, indexed with numbers in the range 0 to 56 (as shown above), a total of 42 pieces including duplicates, which can be used to assemble most of the level 5 standard 6-piece burrs. Uses David Winkler's numbering. Four puzzle and clue cards that list the pieces in order from A to F according to the diagram above.
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