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Therearenumerousunsubstantiatedreportsthatnaturalvitaminsaresuperiortosyntheticones,thatfertilizedeggsarenutritionallysuperiortounfertilizedeggs,thatuntreatedgrainsarebetterthanfumigatedgrains,andthelike.
Theword"unsubstantiated"isclosestinmeaningtowhichoffollowing?