Rechteck mit Löcher

great-puzzle
id = 86
status = timer expired
time = 00:30:00.3
unique solutions = 0
animate    
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Rolf LANG - Remsstr. 39 - 71384 Weinstadt | 18:02:04 up 73 days, 12 min, 1 user, load average: 5.42, 5.00, 4.91