instruction:
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.
question:
Three hawser-laid ropes each of 120 fathoms, laid up together in the opposite direction to that of their own lay, will form a cable-laid rope, 100 fathoms in length.
answer:
Three hawser-laid ropes

question:
The strands tend to unlay unless the end of the rope is whipped (i,e, firmly bound) with twine.
answer:
The strands

question:
In some countries, and commercially in Great Britain, cordage is sometimes measured by its diameter.
answer:
cordage