MAYBE ignored inputs: (COMMENT commutativity of universal quantification ) (COMMENT Example 5 of [ Suzuki et al. , SCSS 2016 ] ) NRS: [ (0): |- (forall [a](forall [b][]X)) -> (forall [b](forall [a][]X)) ] Check confluence by Knuth-Bendix criterion uniform writing to temporary file... ./run_snprover.sh ./SMLNJ-5baOwQ.trs NO Problem: forall(lambda(forall(lambda(X)))) -> forall(lambda(forall(lambda(X)))) Proof: Containment Processor: loop length: 1 terms: forall(lambda(forall(lambda(X)))) context: [] substitution: X -> X Qed termination proof failed result: MAYBE time: 0 msec.