sentence: Some knots work well to hold people as they climb.
sentences_before: Spelunkers tie their ropes with different kinds of knots, like the 'farmer's hitch knot' and the 'alpine butterfly knot'. Spelunkers choose different knots for different purposes.
sentences_after: Other knots are best for tying ropes together.
concept_name: knot
headings: Caving Spelunkers and their equipment
categories: Hobbies Caves