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3.5m – 8.5m Aluminium TRIPLE Section Extension Ladders & Stabiliser Feet –39 Rung- Lightweight Metal Construction – Non-Slip Feet & Treads – Ribbed 'D' Rungs – 3 Ladder Adjustable Height : Amazon.co.uk: DIY & Tools
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How do I calculate the length of a ladder I need to reach a certain height? - Home Improvement Stack Exchange
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