la boîte aux lettres
la boîte à lettre
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la boîte aux lettres ?
l a WORD_BOUNDARY b w a t WORD_BOUNDARY o WORD_BOUNDARY l ɛ t ʁ WORD_BOUNDARY
l a WORD_BOUNDARY b o î t e WORD_BOUNDARY a u x WORD_BOUNDARY l e t t r e s WORD_BOUNDARY