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: harry potter is a series of seven fantasy novels written by british author j. k. rowling.

SOLUTION: harry potter is a group of seven fantasy books written by british author j. k. rowling.

PROBLEM: a mutant is a type of fictional character that appears in comic books published by marvel comics.

SOLUTION: mutants are fictional characters that appear in marvel comic books.

PROBLEM: in a departure from his usual repertoire , he sang " you ' ll never walk alone " from the broadway musical carousel at the berlin live 8 concert in 2005.

SOLUTION:
to be different , he sang " you ' ll never walk alone " from the broadway musical carousel at the berlin live 8 concert in 2005.