In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.

[Q]: some define the hadopelagic as waters below 6,000 m -lrb- 19,685 ft -rrb- , whether in a trench or not.
[A]: some define the hadopelagic as waters below 6,000 m -lrb- 19,685 ft -rrb- , whether it is in a moat or n.


[Q]: they are rivaled as biological materials in toughness only by chitin.
[A]: only chitin rivals them as biological materials.


[Q]: it has long been the economic centre of northern nigeria , and a centre for the production and export of groundnuts.
[A]:
it has been the economic centre of nigeria and a centre for production and export of groundnuts.