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.

[EX Q]: Ropes are made from vegetable fibres each of which is only between two and four feet long, and the first process is to comb these fibres out in a long, even ribbon, as shown in an exaggerated form in fig. 6-1.
[EX A]: Ropes

[EX Q]: Furthermore, cable-laid rope, being more solid in construction, is more resistant to chafe and does not absorb water so readily as hawser-laid rope.
[EX A]: cable-laid rope

[EX Q]: The fibre selected, therefore, depends on the use for which the rope is intended.
[EX A]:
The fibre selected