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| Factor | × | How it was derived |
|---|---|---|
| Style | 1.50 | Trial 1.50 ← |
| Difficulty | 0.60 | Beginner |
| Length | 2.00 | Bucket 13 (5:30 and over)bucket inferred from the author time |
| Bonus | 1.00 | No bonus applies |
10 × 1.50 × 0.60 × 2.00 × 1.00 = 18.00, rounded to 18. Why these factors.