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Informal description: ""

{λ[x: nat ] .​ λ[y: nat ] .​ λ[two1:{(y) .​ (x)} .​ ii ] .​ λ[three1:{(y) .​ (x)} .​ iii ] .​ λ[u: nat ] .​ λ[du:{(u) .​ (y) .​ (x)} .​ diffprop ] .​ λ[v: nat ] .​ λ[dv:{(v) .​ (x) .​ (y)} .​ diffprop ]} .​ < con > .​ {({(x) .​ ({(u) .​ (v)} .​ pl )} .​ satz7 ) .​ ({(dv) .​ (v) .​ (du) .​ (u) .​ (three1) .​ (two1) .​ (y) .​ (x)} .​ t6a ) .​ ( con ) .​ ({({(x) .​ ({(u) .​ (v)} .​ pl )} .​ pl ) .​ (x)} .​ is )} .​ mp

Validation parameters: sort hierarchy = "Z2", kernel options = ""