给定以下六组数字 [4, 6, 8], [1, 3, 5], [11, 13, 15], [20, 25, 30], [2, 4, 6], [15, 18, 21]，用逗号分隔它们，按从小到大的顺序排序，然后将其倒序。
1,3,5,2,4,6,4,6,8,11,13,15,15,18,21,20,25,30 -> 30,25,20,21,18,15,15,13,11,8,6,4,6,4,3,2,5,1