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Informal description: ""

{λ[a:Prop] .​ λ[b:Prop] .​ λ[c:Prop] .​ λ[o:{(b) .​ (a)} .​ or ]} .​ <{(c) .​ (b) .​ (a)} .​ or3 > .​ {({(o) .​ ({(b) .​ (a)} .​ or ) .​ (c)} .​ ori2 ) .​ (b) .​ (a) .​ (c)} .​ th4

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