In this task, you are given a sentence. You must find the primary subject in the supplied sentence. The output must be a sub-sequence in the sentence.

The ribbons are then twisted up into yarns, and the twist given binds the fibres firmly together so that they hold by friction when the yarn is subjected to strain.
The ribbons

American hemp is about equal to European hemp, but is not used by the Admiralty.
American hemp

Weights and breaking strengths can be taken as being the same as those of cordage of similar size, material and normal lay.

Weights and breaking strengths