Large Empty Space

This sudoku has a 5 x 6 empty rectangular space (blue area). I believe it is the largest empty rectangular hole possible in a sudoku. Despite the large hole, this puzzle is really easy to solve.

 

--67-35--

----4----

5-------2

9-------7

-3-----4-

8-------1

1-------4

---------

-5926731-

 

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Taken on May 6, 2008