unduplicated
adjective
un·du·pli·cat·ed
ˌən-ˈdü-pli-ˌkā-təd
also -ˈdyü-
: not duplicated
an often-imitated but unduplicated design
… these collections in major part are unduplicated anywhere else and totally irreplaceable.—S. Dillion Ripley
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Merriam-Webster unabridged
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