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| Factor | × | How it was derived |
|---|---|---|
| Style | 0.55 | PressForward 0.55 ← |
| Difficulty | 0.60 | Beginner |
| Length | 1.28 | Bucket 6 (1:36-1:51)bucket inferred from the author time |
| Bonus | 1.00 | No bonus applies |
10 × 0.55 × 0.60 × 1.28 × 1.00 = 4.22, rounded to 4. Why these factors.