给定一组包含学生姓名和成绩的数据，按成绩的降序排列输出前5名的学生的姓名和成绩。


{name: "Alice", score: 85},
{name: "Bob", score: 92},
{name: "Charlie", score: 78},
{name: "David", score: 90},
{name: "Emma", score: 87},
{name: "Frank", score: 80},
{name: "Grace", score: 95},
{name: "Henry", score: 88},
{name: "Ivy", score: 83},
{name: "Jack", score: 91}
按成绩降序排列，并输出前五名学生姓名和成绩：


{name: "Grace", score: 95}

{name: "Bob", score: 92}

{name: "Jack", score: 91}

{name: "David", score: 90}

{name: "Henry", score: 88}