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Informal description: ""

{λ[a:Prop] .​ λ[b:Prop] .​ λ[c:Prop] .​ λ[d:Prop] .​ λ[e:Prop] .​ λ[f:Prop] .​ λ[o1:{(c) .​ (b) .​ (a)} .​ or3 ] .​ λ[p1:{(f) .​ (e) .​ (d)} .​ ec3 ] .​ λ[i:{(d) .​ (a)} .​ imp ] .​ λ[j:{(e) .​ (b)} .​ imp ] .​ λ[k:{(f) .​ (c)} .​ imp ] .​ λ[d1:d]} .​ <(c) .​ not > .​ λ[x:c] .​ {({(d1) .​ (p1) .​ (f) .​ (e) .​ (d)} .​ ec3e13 ) .​ ((x) .​ k) .​ ( con ) .​ (f)} .​ mp

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