 In standard written Finnish, there are certain words ending with the letter i which, when spoken, end in a consonant with the i appearing only by liaison when case endings are added, but carry the last i in the formal dictionary form.This does not apply to certain other words ending in i such as "tuli" (fire), "takki" (jacket), "nupi" (tack), and "taksi" (taxi), where the final i is always pronounced in colloquial spoken Finnish and the i is thus critical to the meaning.Also, in standard language, an "I-E mutation" is seen, where is used in the nominative and in some oblique forms (see Finnish phonology).