| # kx0 = # ax1, adr ∈ ri[key, adr1][kx0, ax1] ↔ adr ∈ ax1 ∨ adr ∈ ri[key, adr1] \ kx0.toSet, adr ∈ ri[key, adr1][kx0, ax1] ⊦ adr = adr1, dups(kx0), key ∈ kx0, adr ∈ ax1, adr ∈ (ri \ kx0.toSet) -- key |
# kx0 = # ax1, adr ∈ ri[key, adr1][kx0, ax1], adr ∈ ri[key, adr1] \ kx0.toSet ⊦ adr = adr1, dups(kx0), adr ∈ (ri \ kx0.toSet) -- key, adr ∈ ax1, key ∈ kx0