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| Factor | × | How it was derived |
|---|---|---|
| Style | 0.55 | PressForward 0.55 ← |
| Difficulty | 0.60 | Beginner |
| Length | 1.22 | Bucket 5 (1:21-1:36)bucket inferred from the author time |
| Bonus | 1.00 | No bonus applies |
10 × 0.55 × 0.60 × 1.22 × 1.00 = 4.03, rounded to 4. Why these factors.