djo bau lujvo

m₁=b₁ is the Saudi Arabic language used by b₂ to express/communicate b₃ (si'o/du'u, not quote).

Cf. sadjo, bangu, rabybau, bangaru'a, bangarubu.

jbovlaste

In notes:

bangaru'a: x₁ is the language with ISO 639-3 code “ara” (Arabic).