Add Letters To Unique Random Number Macro

Mar 31, 2014

Is it possible to add letters to this "Unique random number" generator it is very fast and takes only 5s to run on 50,000 rows, I have a different "Unique random Sequence generator" macro but it takes about 30 minutes to run on 50,000 rows

Code:

Sub generateuniquerandom()
Dim b() As Boolean, e As Range, k&, x&
Dim lRow As Long
With Sheets(1)
lRow = .Range("F" & .Rows.Count).End(xlUp).Row

[Code]...

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A
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[Code]...

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[Code]...

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