TASK DEFINITION: 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.
PROBLEM: the string can vibrate in different modes just as a guitar string can produce different notes , and every mode appears as a different particle : electron , photon , gluon , etc.

SOLUTION: the string can vibrate as a guitar string and produces different notes.

PROBLEM: by most accounts , the instrument was nearly impossible to control.

SOLUTION: most people said that the device was very hard to control.

PROBLEM: the archetypal pencil may have been the stylus , which was a thin metal stick , often made from lead and used for scratching in papyrus , a form of early paper.

SOLUTION:
a form of early archetypal , thin , metal pencil , often used for scratching in papyrus.