syllable. When the first letter of a syllable has a tone mark or other diacritic, the diacritic may be omitted from the initialism, for example ĐNA or ĐNÁ for (Southeast Asia) and LMCA or LMCÂ for Liên minh châu Âu (European Union). The letter "Ư" is often replaced by "W" in initialisms to avoid confusion with "U", for example UBTWMTTQVN or UBTƯMTTQVN for Ủy ban Trung ương Mặt trận Tổ quốc Việt Nam (Central Committee of the Vietnamese Fatherland Front). Initialisms are purely a written convenience, being pronounced the same way as their expansions. As the names of many Vietnamese letters are disyllabic, it would be less convenient to pronounce an initialism by its individual letters. Acronyms pronounced as words are rare in Vietnamese, occurring when an acronym itself is borrowed from another language. Examples include (), a respelling of the French acronym SIDA (AIDS); (), a literal reading of the English initialism for Voice of America; and NASA (), borrowed directly from the English acronym. As in Chinese, many compound words can be shortened to the first syllable when forming a longer word. For example, the term Việt Cộng is derived from the first syllables of "Việt Nam" (Vietnam) and "Cộng sản" (communist). This mechanism is limited to Sino-Vietnamese vocabulary. Unlike with Chinese, such clipped compounds are considered to be portmanteau words or blend words rather than acronyms or initialisms, because the Vietnamese alphabet still requires each component word to be written as more than one character. General grammatical considerations Declension In languages where nouns are declined, various methods are used. An example is Finnish, where a colon is used to separate inflection from the letters: An acronym is pronounced as a word: Nato – "into Nato", Nasalta "from NASA" An acronym is pronounced as letters: EU – "into EU" An acronym is interpreted as words: EU – "into EU" The process above is similar to the way that hyphens are used for clarity in English when prefixes are added to acronyms: thus pre-NATO policy (rather than preNATO). Lenition In languages such as Scottish Gaelic and Irish, where lenition (initial consonant mutation) is commonplace, acronyms must also be modified in situations where case and context dictate it. In the case of Scottish Gaelic, a lower-case h is often added after the initial consonant; for example, BBC Scotland in the genitive case would be written as , with the acronym