question: What was an important feature of the Premier League in the mid-2000s ?
answer: the dominance of the so-called `` Big Four '' clubs : Arsenal , Chelsea , Liverpool and Manchester United
turker_answer: An important feature of the Premier League in the mid-2000s was the dominance of the so-called `` Big Four '' clubs : Arsenal , Chelsea , Liverpool and Manchester United .
rule-based: An important feature of the Premier League in the mid-2000s was the dominance of the so-called `` Big Four '' clubs : Arsenal , Chelsea , Liverpool and Manchester United .