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pillar box
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APASmart Define. (2015). letter box thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/letter_box/thesaurus/narrower
ChicagoSmart Define. 2015. "letter box thesaurus" https://smartdefine.org/letter_box/thesaurus/narrower (accessed September 23, 2026).
HarvardSmart Define 2015, letter box thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/letter_box/thesaurus/narrower>.
MLASmart Define. "letter box thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/letter_box/thesaurus/narrower>