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Laid rope is constructed by twisting fibers into strands. This method involves taking individual fibers, typically made from natural or synthetic materials, and twisting them together to form a single strand. Multiple strands are then twisted together in the opposite direction to create the completed rope. This construction method provides a rope that is flexible, durable, and can resist kinks and tangles when used in various applications, such as firefighting, climbing, or marine environments.

The other methods mentioned do not accurately describe how laid rope is constructed: braiding fibers together refers to a different technique that results in a different type of rope, braiding a core with a sheath describes a construction method used in some types of specialty ropes, typically for added strength or durability, and fitting strands in a zigzag pattern does not describe a recognized method of rope construction.