TASK DEFINITION: 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.
PROBLEM: It is marked with a red rogue's yarn in each strand.

SOLUTION: It

PROBLEM: The fibre selected, therefore, depends on the use for which the rope is intended.

SOLUTION: The fibre selected

PROBLEM: 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.

SOLUTION:
Ropes