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I am having trouble creating a program in Visual Basic that prints the * in a diamond shape

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I am having trouble creating a program in Visual Basic that prints the * in a diamond shape. Do you have any suggestions?

This is what I have so far. It is an un-proportioned diamond, I need a normal diamond. What am I doing wrong?

Dim i As Integer
Dim y As Integer
Dim j As Integer

For i = -9 To 9
y = System.Math.Abs(i)
y = (y * (-1)) + 10

Console.WriteLine("")
For j = 1 To y
Console.Write("*")
Next

i += 1
Next

Any help is greatly appreciated.