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.

This process is known as 'spinning', and the yarns are said to be spun left- or right-handed, according to the direction of twist.
This process

When mature the abaca plant, which grows to a height of from 10 to 30 ft, is felled and the fibre from the leaf sheaths is stripped off.
the abaca plant

This stage is known as 'twisting the strands', and again, the twist can be left- or right-handed.
This stage