Kakuro
Tutorial -- Challenging
The only valid combinations remaining for 7 in 2 are 1 and 6 or 2 and 5. After filling in the 5 and 6, we see that the only valid combinations remaining for 8 in 2 are 2 and 6 or 3 and 5.
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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