Detailed Instructions: 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:Left-handed ropes, in which each component is made in exactly the opposite direction, are found in commercial practice; but the only left-handed cordage supplied to the Royal Navy - and that in very small quantities - is hammock Iashing and marline.
Solution:
Left-handed ropes