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.
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Question: It is used in the Royal Navy only for small lines and small stuff.

Answer: It

Question: In some countries, and commercially in Great Britain, cordage is sometimes measured by its diameter.

Answer: cordage

Question: Manila hawser-laid rope is supplied to the Royal Navy in coils of 120 fathoms, and it is marked with one red rogue's yarn in each of two strands.

Answer:
Manila hawser-laid rope