rok ske lujvo

s₁=r₁ is petrology [science about rock/stone] based on methodology s₃.

terdi2, terdi3 and saske2 subsumed. See also derske,kunske,rokci.

jbovlaste

In notes:

derske: s₁=d₁ is soil science [science about earth/soil] based on methodology s₃.
terderske: s₁=t₁ is pedalogy [science about soil composition] based on methodology s₃.