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13 = 7+
6
7
5
13 = 5+
6
8
7
13 = 9+
4
3
5
13 = 6+
6
8
7
4
13 = 8+
6
5
13 = + 4
9
8
7
14 = + 5
9
8
7
14 = + 8
5
6
7
14 = 7+
5
6
7
14 = 6+
7
9
8
14 = + 9
4
5
6
15 = + 9
6
5
7
15 = + 8
9
7
8