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 | 15:25:40 up 75 days, 21:35, 0 user, load average: 5.20, 4.86, 4.92