question: What has the UK political system functioned as ?
answer: a two-party ( sometimes called a `` two-and-a-half party '' ) system
turker_answer: the UK political system functioned asa two-party ( sometimes called a `` two-and-a-half party '' ) system
rule-based: The UK political system has functioned as a two-party ( sometimes called a `` two-and-a-half party '' ) system .