152..
.4...
.3...
.6...
.....
235..
.1...
.4...
.6...
.....
142..
.3...
.6...
.5...
.....
146..
.2...
.3...
.5...
.....
315..
.4...
.2...
.6...
.....
3 5
4
1 5
2
1 3