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Informal description: ""

{λ[x: nat ] .​ λ[y: nat ]} .​ <{({(y) .​ (x)} .​ pl ) .​ (y)} .​ nis > .​ {(y) .​ (λ[z: nat ] .​ λ[u:{(z) .​ (x)} .​ prop1 ] .​ {(u) .​ (z) .​ (x)} .​ t4 ) .​ ((x) .​ t2 ) .​ (λ[z: nat ] .​ {(z) .​ (x)} .​ prop1 )} .​ induction

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