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: On no account must stage lashing be used for paint ship stages.

SOLUTION:  stage lashing

PROBLEM: The quality of the finished rope depends upon the thorough cleaning of the fibre during this stripping process.

SOLUTION: the finished rope

PROBLEM: Three hawser-laid ropes each of 120 fathoms, laid up together in the opposite direction to that of their own lay, will form a cable-laid rope, 100 fathoms in length.

SOLUTION:
Three hawser-laid ropes

