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Synonyms for First line of defense. (2016). Retrieved 2026, July 31, from https://thesaurus.plus/synonyms/first_line_of_defense
Synonyms for First line of defense. N.p., 2016. Web. 31 Jul. 2026. <https://thesaurus.plus/synonyms/first_line_of_defense>.
Synonyms for First line of defense. 2016. Accessed July 31, 2026. https://thesaurus.plus/synonyms/first_line_of_defense.