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The Coated Burr can be assembled in 4 ways. But only one of those 4 ways (the most complex solution -- level 5) will leave the IPP18 logo unblemished in its undiminished entirety. The following solution will get the IPP18 symbol assembled correctly .

( All puzzle pictures below (and photo at left) are courtesy of
Karin & Jürg von Känel from their wonderful website )

 Karin & Jürg von Känel's World of Wooden Puzzles

STEP 1                                                     STEP 2                                                     STEP 3

Step 1: assemble the IPP18 piece and its coat piece.
Step 2: add the piece with the one cube cutout and slide the IPP18 piece all the way up.
Step 3: add the only symmetrical coat piece.

STEP 4                                                     STEP 5                                                     STEP 6

Step 4: add the last remaining internal piece (the one with the jvk logo)
Step 5: add the last coat
Step 6: slide all pieces in place (in the order indicated by the arrows)