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.

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

[EX Q]: to provide water for its steam locomotives , the commissioners decided to provide a dam and pump water from it to a facility , known as young tank , at the post.
[EX A]: to provide water for its steam locomotives at the location , the commissioners decided to provide a dam and pump water from it to a facility , known as young tank.

[EX Q]: postal systems often have functions other than sending letters.
[EX A]:
postal system send letters and provide other services.