In some languages, vowel length is sometimes better analyzed as a sequence of two identical vowels. In Finnic languages, such as Finnish, the simplest example follows from consonant gradation: "haka → haan". In some cases, it is caused by a following chroneme, which is etymologically a consonant: "jää" "ice" ← Proto-Uralic *"jäŋe". In non-initial syllables, it is ambiguous if long vowels are vowel clusters; poems written in the Kalevala meter often syllabicate between the vowels, and an (etymologically original) intervocalic "-h-" is seen in that and some modern dialects ("taivaan" vs. "taivahan" "of the sky"). Morphological treatment of diphthongs is essentially similar to long vowels. Some old Finnish long vowels have developed into diphthongs, but successive layers of borrowing have introduced the same long vowels again so the diphthong and the long vowel now again contrast ("nuotti" "musical note" vs. "nootti" "diplomatic note").