Rechthoek van 39x76 met 12 gaten (waarvan er 6 noodzakelijk zijn) gemaakt met de 369 octomino's.
Helmut mailde ons:
This took me about a month during student vacations.
This happened in the good old days whan I had so much spare time left :-)
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| Helmut Postl-Oostenrijk Rechthoek van 39x76 met 12 gaten (waarvan er 6 noodzakelijk zijn) gemaakt met de 369 octomino's. Helmut mailde ons: This took me about a month during student vacations. This happened in the good old days whan I had so much spare time left :-) |
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