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Synonyms for As firm as a rock. (2016). Retrieved 2024, May 19, from https://thesaurus.plus/synonyms/as_firm_as_a_rock
Synonyms for As firm as a rock. N.p., 2016. Web. 19 May. 2024. <https://thesaurus.plus/synonyms/as_firm_as_a_rock>.
Synonyms for As firm as a rock. 2016. Accessed May 19, 2024. https://thesaurus.plus/synonyms/as_firm_as_a_rock.