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.

[Q]: The ropes supplied to the Royal Navy are made from various kinds of vegetable fibre which may differ in strength, weight, flexibility, hardness or resistance to wear, elasticity, resistance to weather, or behaviour when wet.
[A]: The ropes


[Q]: The rope will stretch under load, but may be expected to regain its normal length when slack, provided that the load applied is well within the breaking strength of the rope;
[A]: The rope


[Q]: The shorter the length of the fibres the harder this twist must be to give the necessary strength to the yarn.
[A]:
the yarn