There are a number of noticeable traits common to most Finno-Samic languages, however none of them unquestionably in favor of a family unity. The first of these is the presence of consonant gradation, found in all of the languages except the marginal languages of the group, Livonian, Veps and Southern Sami. Gradation is also found in the distantly related Samoyedic Nganasan, and it has been debated if gradation is an original Uralic feature suppressed in all other branches, an independent innovation in Finno-Lappic and Nganasan, or independent in all three of Finnic, Samic and Nganasan. Also, even if gradation in Finnic and Samic is connected, it is disputed whether this represents common inheritance or later contact influence.