主题：[求助]随机组合出现重复怎么办？

Dim a() As String = {"张","林","陈"，“王”，“李”}
Dim b() As String = {"建国"，“国庆”，“旺财”}
Dim c() As String = {"男","女"}
For Index As Integer = 0 To 10
    Output.Show(a(rand.Next(0,5)) & b(rand.Next(0,3)) & c(rand.Next(0,2)))
Next

以上代码如何杜绝重复?