run bau lujvo

r₁=b₁ is an artificial/constructed language used by b₂ to express/communicate b₃ (si'o/du'u, not quote).

Artificial languages do not necessarily have speakers, cf. bangu.

lensisku

In notes:

itku'ile: x₁ pertains to Ithkuil/Ilaksh/Elartkʰa language in aspect x₂
lesrunbau: x₁ is a philosophical conlang used by x₂ to communicate x₃.
pa'arbau: b₁ is Esperanto.
rarbau: b₁ is a natural language spoken by community b₂ to express b₃.
tokpona: x₁ reflects Toki Pona culture/nationality/language in aspect x₂