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 | 19:54:28 up 76 days, 2:04, 2 users, load average: 5.43, 5.09, 4.94