A quick one this as the question comes up time and again.
Sort your sheet by the numbers you are trying to find duplicates on (in this instance we shall call it column A)
Then in a spare column type this formula
=if(A1=A2,1,0)
Then switch on auto filter and filter by 1 on your column with the equation
Then delete these 1s
This should leave you with a set of de-duped refs.
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