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Other dialects have different inventories; Putèr, for instance, lacks [au], [ɛu], and [uɛ] as well as the triphthongs but has [yə], which is missing in Sursilvan. A phenomenon known as "hardened diphthongs", in which the second vowel of a falling Diphthong is pronounced as [k], was once common in Putèr as well, but is nowadays limited to Surmiran: strousch 'barely > [ʃtrokʃ].[citation needed]