Kakuro
Tutorial -- Challenging
30 in 4 must be 6, 7, 8, and 9, so we fill in the possibilties.
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13
10
8
3
27
12
11
7
8
24
5
27
26
16
9
12
12
11
21
30
39
17
10
6
10
12
8
18
10
7
13
14