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  1. Rule of One-Fifth: Free-falling pieces so they land flat...

    Rule of One-Fifth: Free-falling pieces so they land flat...

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  2. Tipping Vertical Wood: The Rule of Fifth's | The Fundamentals of General Tree Work by G.F. Beranek

    Tipping Vertical Wood: The Rule of Fifth's | The Fundamentals of General Tree Work by G.F. Beranek

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