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Theorem decl-01

RED1 (t; tn) { TOPRED(t; tn) ; if tn = none ∧ ap(t) then { RED1(t .1; tn) ; if tn ≠ none then tn := some(tn .t _ t .2) else if value(t .1) then { RED1(t .2; tn) ; if tn ≠ none then tn := some(t .1 _ tn .t) } } }