⊦ adr ∈ as | n ↔ adr.lnum = n ∧ adr ∈ as
⊦ adr.lnum = m ∧ adr ∈ as ++ @(m0, m1, m2) ↔ adr ∈ as | m, m = m0
Used terms: m, as ++ @(m0, m1, m2), adr