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Find Duplicates Within A Percent Tolerance

Hi, I searched on the forums and found some answers to tolerance and duplicate related questions, but this one is a little different. Below is a short segment of my excel spreadsheet:

A B
1020.00242 -89.84
1020 -88.11
1021 -85.3
1021.494 -80.41
1021.49 -86.98
1030.04 -89.4
1030.042 -88.26
1030.94 -79.98
1030.933 -81.5
1030.961 -85.87
1040.0418 -88.77
1040.391 -87.3
1040.291 -82.94
1040.016 -84.12
1049.82 -84.7


What I need to do is write a macro that will find duplicates in Column A, within a changeable tolerance, say 0.1 (10%).

After finding all duplicates within a tolerance in A, I need to make another "Master" worksheet with the Duplicates from A, and their counterpart in B. So if A1 and A4 where within 10% of each other, the "Master" worksheet would contain:

A1 B1
A4 B4

using the values, giving:

1020.00242 -89.84
1021.494 -80.41

I tried using SUMPRODUCT and some other functions but just can't seem to put my finger on this one. I'm sure it's not hard and am overlooking something. Any help would be greatly appreciated. Thanks.

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