Rechteck mit Löcher

great-puzzle
id = 86
status = timer expired
time = 00:30:00.3
unique solutions = 0
using part
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Rolf LANG - Remsstr. 39 - 71384 Weinstadt | 16:31:14 up 71 days, 22:41, 0 user, load average: 4.99, 4.87, 4.88