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.

at the same time the strands are rotated individually in the direction of their original twist.
the strands

Its wearing qualities are about the same as those of manila, but it is far more flexible.
It

As the rope is laid up its length contracts like a coiled spring, giving it a certain elasticity.

its length