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foreword	milestones	version 2	version 2	(background - core - applications)	library	(static LDDL directory)
citations	visibility	version 1	version 1	(static HELM directory)	helena

Informal description: ""

{λ[a:Prop] .​ λ[b:Prop] .​ λ[c:Prop] .​ λ[o:{(c) .​ (b) .​ (a)} .​ or3 ] .​ λ[n:(a) .​ not ]} .​ <{(c) .​ (b)} .​ or > .​ {(n) .​ (o) .​ ({(c) .​ (b)} .​ or ) .​ (a)} .​ ore2

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