主题：[求助]

看了论坛中关于排列组合的帖子，指点一下 AddRange("a?b?c?d?e?f?g?h?i?j?k?l?m?n?o?p?q?r?s?t".split("?"))这句代码是什么意思？

 是以？为分割符号，把字符串a?b?c?d?e?f?g?h?i?j?k?l?m?n?o?p?q?r?s?t分割成a b c d...等单个字符吗？

Dim nlist As new List(of String)
nlist.AddRange("01?02?03?04?05?06".split("?"))
Dim slist As new List(of String)
Dim str As String
For i As Integer = 0 To nlist.count -1
    For j As Integer = 0 To nlist.count -1
        For k As Integer = 0 To nlist.count -1
            If i<>j AndAlso i <> k AndAlso j <> k Then
                str=nlist(i) & nlist(j) & nlist(k)
                If slist.Contains(str)=False Then
                    slist.Add(str)
                End If
            End If
        Next
    Next
Next
For Each s As String In slist
    output.show(s)
Next
我把上面的代码测试了一下，会出现010203、010302等情况，如果不考虑位置比如彩piao选号，应该怎么改？

感谢高手