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thumb|right|200px|Climbing the ratlines of STS Mir|STS Mir thumb|right|200px|Rat-boards and rigging of Christian Radich
thumb|right|200px|Climbing the ratlines of STS Mir|STS Mir thumb|right|200px|Rat-boards and rigging of Christian Radich
Ratlines () are lengths of thin line tied between the shrouds of a sailing ship to form a ladder. Found on all square-rigged ships, whose crews must go aloft to stow the square sails, they also appear on larger fore-and-aft rigged vessels to aid in repairs aloft or conduct a lookout from above.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).