Compared with most other Romance languages, Italian has many inconsistent outcomes, where the same underlying sound produces different results in different words, e.g. > "lasciare" and "lassare", > "cacciare" and "cazzare", > "sdrucciolare", "druzzolare" and "ruzzolare", > "regina" and "reina". Although in all these examples the second form has fallen out of usage, the dimorphism is thought to reflect the several-hundred-year period during which Italian developed as a literary language divorced from any native-speaking population, with an origin in 12th/13th-century Tuscan but with many words borrowed from languages farther to the north, with different sound outcomes. (The La Spezia–Rimini Line, the most important isogloss in the entire Romance-language area, passes only about 20 miles to the north of Florence.) Dual outcomes of Latin /p t k/ between vowels, such as > "luogo" but > "fuoco", was once thought to be due to borrowing of northern voiced forms, but is now generally viewed as the result of early phonetic variation within Tuscany.