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In page Finnish phonology:

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[f] does not appear in native words, but is reliably distinguished by Finnish speakers. Other foreign fricatives are not. š or sh [ʃ] appears only in non-native words, sometimes pronounced [s], although most speakers make a distinction between e.g. šakki 'chess' and sakki 'a gang (of people)'.[citation needed] The orthography also includes the letters z and ž, although their use is marginal, and they have no phonemic status. For example, azeri and džonkki may be pronounced [ɑseri] and [tsoŋkki] without fear of confusion. The letter z, found mostly in foreign words and names such as Zulu, may also be pronounced as [t͡s] following the influence of German, thus Zulu /t͡sulu/.