Law of Leftover
When two houses overlap in three cells, the six cells outside the overlap on either side contain the same set of digits.
How it works on this board
Compare △ and ○ outside the shared ◇ cells
4
1
3
5
6
3
3
7
9
5
4
7
3
9
6
2
6
9
5
4
8
5
2
8
5
3
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