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ability, competence, aptitude
ability, competence, aptitude
ability, competence, aptitude
ability, competence, aptitude
ability, competence, aptitude

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Synonyms for Efficacy. (2016). Retrieved 2020, November 29, from https://thesaurus.plus/synonyms/efficacy
Synonyms for Efficacy. N.p., 2016. Web. 29 Nov. 2020. <https://thesaurus.plus/synonyms/efficacy>.
Synonyms for Efficacy. 2016. Accessed November 29, 2020. https://thesaurus.plus/synonyms/efficacy.