Unknown number of nested loops

Hello, I've got a problem I've been banging my head upon for three days by now.
I'll try to put it as simply as I can. Basically, I've got a list of lists, for example like this:

1. KPP1, KPP2
2. VAP1, VAP2, VAP3
3. T1, T2


What i need is to iterate through this list and build a list like this:
KPP1-VAP1-T1
KPP1-VAP1-T2
KPP1-VAP2-T1
KPP1-VAP2-T2
KPP1-VAP3-T1
KPP1-VAP3-T2
KPP2-VAP1-T1
KPP2-VAP1-T2
KPP2-VAP2-T1
KPP2-VAP2-T2
KPP2-VAP3-T1
KPP2-VAP3-T2

Normally it woudln't be a problem, but to me the number of 'levels' in this is unknown and can be any, for example as simple as this:
1. KPP1

or like this
1. KPP1, KPP2, KPP3
2. VAP1, VAP2
3. T1, T2, T3, T4, T5
4. X1, X2, X3, X4

Since I don't know how many levels and how many elements at each level there is I cannot simply make a necessary number of nested loops - I've got to think of something different. Any ideas?

This sounds like a job for... dun dah dah duuun... recursion.

Code:

---

Private Sub DisplayItems(list As IEnumerable)
    For Each item In list
        Dim sublist = TryCast(item, IEnumerable)

        If sublist Is Nothing Then
            MessageBox.Show(item.ToString())
        Else
            DisplayItems(sublist)
        End If
    Next
End Sub

---

Oops. Why didn't I think of it myself? Thanks. :bigyello: