Rechteck mit Löcher

22.Problem
id = 141
time = 00:00:00.4
unique solutions = 0
animate    
XML
Rolf LANG - Remsstr. 39 - 71384 Weinstadt | 09:00:21 up 75 days, 15:10, 0 user, load average: 4.57, 4.70, 4.80