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56 + 35 = 91.

Each pair of numbers not in the runs from lower to higher differ by the number after them times that number minus two. So:

15 - (3)(1) = 12

28 - (4)(2) = 20

45 - (5)(3) = 30

66 - (6)(4) = 42

91 - (7)(5) = 56

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