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Informal description: ""

{λ[sigma:Set] .​ λ[s0:sigma] .​ λ[t0:sigma] .​ λ[s:sigma]} .​ <sigma> .​ {(s) .​ (t0) .​ (sigma) .​ ({(s0) .​ (s) .​ (sigma)} .​ is )} .​ ite

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