Tongwe language

Tongwe (Sitongwe) and Bende (Sibende) constitute a clade of Bantu languages coded Zone F.10 in Guthrie's classification. According to Nurse & Philippson (2003), they form a valid node. Indeed, at 90% lexical similarity they may be dialects of a single language.

Phonology
Additionally, Bende has four tones; high, low, rising, and falling.