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Public Class Form1
Public Delegate Function ReturnReversedString(ByVal input As String) As String
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim msg As String = "Hello World!"
Dim rrs As New ReturnReversedString(AddressOf ReverseString)
msg = rrs(msg)
Private Function ReverseString(ByVal input As String) As String
Dim sb As New System.Text.StringBuilder
For i As Integer = input.Length - 1 To 0 Step -1
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