Duplicates question: how to find and eliminate both/all

I've looked through this forum for an answer to this...sorry if it's already been answered, but I didn't see it.
I need to be able to 1) find duplicates or multiples in a column and 2) delete both/all, not just one of those duplicates. So, for example, if I start with a column that has:
A
A
B
C
C
C
D
E
E
I want to be left with:
B
D
I do NOT want to be left with:
A
B
C
D
E
Is there a way to do that? Again, sorry if it's been answered, but I couldn't find it, if so.

Really easy.
Assuming that the row 1 is an header one,
in B1, enter:
=IF(COUNTIF(A,A)=1,A,"")
you will get what is shown by "Before"
Select every cell
activate Sort > using Column B > ascending
you will get what is shown by "After"
delete rows 2 thru 9.
That's all folks
Yvan KOENIG (from FRANCE dimanche 23 novembre 2008 16:52:44)

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The formula only works when there are only three "-" in the column value, and the formula will fail if there are more than or less than three "-" in the column value.
I recommend to use Jquery code to replace the characters in the column called IN THIS COLUMN in the UI:
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