Rechteck mit Löcher

22.Problem
id = 141
time = 00:00:00.4
unique solutions = 0
animate    
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Rolf LANG - Remsstr. 39 - 71384 Weinstadt | 00:56:09 up 76 days, 7:06, 0 user, load average: 5.46, 5.06, 4.94