universe@7: 3 _ _ 2 4 _ _ 6 _ universe@7: _ 4 _ _ _ _ _ 5 3 universe@7: 1 8 9 6 3 5 4 _ _ universe@7: _ _ _ _ 8 _ 2 _ _ universe@7: _ _ 7 4 9 6 8 _ 1 universe@7: 8 9 3 1 5 _ 6 _ 4 universe@7: _ _ 1 9 2 _ 5 _ _ universe@7: 2 _ _ 3 _ _ 7 4 _ universe@7: 9 6 _ 5 _ _ 3 _ 2