It was first used in the protolanguage Otomanguean. The full reconstruction of an unrecorded protolanguage is an open-ended task. Especially in Finland, there has been a growing tendency to reject the Finno-Ugric intermediate protolanguage. It is likely that either Old Church Slavonic or the protolanguage Proto-Slavic is intended. Special attention is paid to the language studies, especially to the Baltic protolanguage. There remains some disagreement over the Algonquian "Urheimat" (homeland of the protolanguage). The phonological system of the protolanguage has nine consonants, four vowels, and four tones. In the regions ruled by Novgorod, the protolanguage started to evolve into Karelian language.