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.
One example is below.
Q: Rope and its Usage
A: Rope
Rationale: The word 'Rope' is the key subject here, while Usage is a property of Rope.
Q: Man-made braided cordage is also used where flexibility, strength and durability are needed, such as in safety nets of carriers and in signal halyards.
A:
Man-made braided cordage