Use a different source as your DV list that only has one of each entry.
If your list is as short as you say, then manually typing it would be the
If, in fact it is a much bigger list in reality, then use Advanced filter
Select your source range>Data>Advanced Filter>Unique values only>Copy to new
location say C2
Create a dynamic range for your DV
Refers to =$C$2:INDEX($C:$C,COUNTA($C:$C))
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