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: 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

PROBLEM: the strands are twisted up together to form the rope, and

SOLUTION: the strands

PROBLEM: This rope is made from the fibre of the abaca plant, which is grown extensively in the Philippine Islands and shipped from the port of Manila (whence its name), and also in Central America, Sumatra and Borneo.

SOLUTION:
This rope