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| def sum_of_products(a, n): | |
| running_totals = [0] * n | |
| for x in a: | |
| for i in range(n - 1): | |
| running_totals[i] += running_totals[i + 1] * x | |
| running_totals[-1] += x | |
| return running_totals[0] |
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