NO Problem 1: (VAR v_NonEmpty:S X:S Y:S Z:S) (RULES fcons(X:S,Z:S) -> cons(X:S,Z:S) first(0,Z:S) -> nil first(s(X:S),cons(Y:S,Z:S)) -> cons(Y:S,first(X:S,Z:S)) first1(0,Z:S) -> nil1 first1(s(X:S),cons(Y:S,Z:S)) -> cons1(quote(Y:S),first1(X:S,Z:S)) from(X:S) -> cons(X:S,from(s(X:S))) quote(sel(X:S,Z:S)) -> sel1(X:S,Z:S) quote(0) -> 01 quote(s(X:S)) -> s1(quote(X:S)) quote1(first(X:S,Z:S)) -> first1(X:S,Z:S) quote1(cons(X:S,Z:S)) -> cons1(quote(X:S),quote1(Z:S)) quote1(nil) -> nil1 sel(0,cons(X:S,Z:S)) -> X:S sel(s(X:S),cons(Y:S,Z:S)) -> sel(X:S,Z:S) sel1(0,cons(X:S,Z:S)) -> quote(X:S) sel1(s(X:S),cons(Y:S,Z:S)) -> sel1(X:S,Z:S) unquote(01) -> 0 unquote(s1(X:S)) -> s(unquote(X:S)) unquote1(cons1(X:S,Z:S)) -> fcons(unquote(X:S),unquote1(Z:S)) unquote1(nil1) -> nil ) Problem 1: Dependency Pairs Processor: -> Pairs: FIRST(s(X:S),cons(Y:S,Z:S)) -> FIRST(X:S,Z:S) FIRST1(s(X:S),cons(Y:S,Z:S)) -> FIRST1(X:S,Z:S) FIRST1(s(X:S),cons(Y:S,Z:S)) -> QUOTE(Y:S) FROM(X:S) -> FROM(s(X:S)) QUOTE(sel(X:S,Z:S)) -> SEL1(X:S,Z:S) QUOTE(s(X:S)) -> QUOTE(X:S) QUOTE1(first(X:S,Z:S)) -> FIRST1(X:S,Z:S) QUOTE1(cons(X:S,Z:S)) -> QUOTE(X:S) QUOTE1(cons(X:S,Z:S)) -> QUOTE1(Z:S) SEL(s(X:S),cons(Y:S,Z:S)) -> SEL(X:S,Z:S) SEL1(0,cons(X:S,Z:S)) -> QUOTE(X:S) SEL1(s(X:S),cons(Y:S,Z:S)) -> SEL1(X:S,Z:S) UNQUOTE(s1(X:S)) -> UNQUOTE(X:S) UNQUOTE1(cons1(X:S,Z:S)) -> FCONS(unquote(X:S),unquote1(Z:S)) UNQUOTE1(cons1(X:S,Z:S)) -> UNQUOTE(X:S) UNQUOTE1(cons1(X:S,Z:S)) -> UNQUOTE1(Z:S) -> Rules: fcons(X:S,Z:S) -> cons(X:S,Z:S) first(0,Z:S) -> nil first(s(X:S),cons(Y:S,Z:S)) -> cons(Y:S,first(X:S,Z:S)) first1(0,Z:S) -> nil1 first1(s(X:S),cons(Y:S,Z:S)) -> cons1(quote(Y:S),first1(X:S,Z:S)) from(X:S) -> cons(X:S,from(s(X:S))) quote(sel(X:S,Z:S)) -> sel1(X:S,Z:S) quote(0) -> 01 quote(s(X:S)) -> s1(quote(X:S)) quote1(first(X:S,Z:S)) -> first1(X:S,Z:S) quote1(cons(X:S,Z:S)) -> cons1(quote(X:S),quote1(Z:S)) quote1(nil) -> nil1 sel(0,cons(X:S,Z:S)) -> X:S sel(s(X:S),cons(Y:S,Z:S)) -> sel(X:S,Z:S) sel1(0,cons(X:S,Z:S)) -> quote(X:S) sel1(s(X:S),cons(Y:S,Z:S)) -> sel1(X:S,Z:S) unquote(01) -> 0 unquote(s1(X:S)) -> s(unquote(X:S)) unquote1(cons1(X:S,Z:S)) -> fcons(unquote(X:S),unquote1(Z:S)) unquote1(nil1) -> nil Problem 1: Infinite Processor: -> Pairs: FIRST(s(X:S),cons(Y:S,Z:S)) -> FIRST(X:S,Z:S) FIRST1(s(X:S),cons(Y:S,Z:S)) -> FIRST1(X:S,Z:S) FIRST1(s(X:S),cons(Y:S,Z:S)) -> QUOTE(Y:S) FROM(X:S) -> FROM(s(X:S)) QUOTE(sel(X:S,Z:S)) -> SEL1(X:S,Z:S) QUOTE(s(X:S)) -> QUOTE(X:S) QUOTE1(first(X:S,Z:S)) -> FIRST1(X:S,Z:S) QUOTE1(cons(X:S,Z:S)) -> QUOTE(X:S) QUOTE1(cons(X:S,Z:S)) -> QUOTE1(Z:S) SEL(s(X:S),cons(Y:S,Z:S)) -> SEL(X:S,Z:S) SEL1(0,cons(X:S,Z:S)) -> QUOTE(X:S) SEL1(s(X:S),cons(Y:S,Z:S)) -> SEL1(X:S,Z:S) UNQUOTE(s1(X:S)) -> UNQUOTE(X:S) UNQUOTE1(cons1(X:S,Z:S)) -> FCONS(unquote(X:S),unquote1(Z:S)) UNQUOTE1(cons1(X:S,Z:S)) -> UNQUOTE(X:S) UNQUOTE1(cons1(X:S,Z:S)) -> UNQUOTE1(Z:S) -> Rules: fcons(X:S,Z:S) -> cons(X:S,Z:S) first(0,Z:S) -> nil first(s(X:S),cons(Y:S,Z:S)) -> cons(Y:S,first(X:S,Z:S)) first1(0,Z:S) -> nil1 first1(s(X:S),cons(Y:S,Z:S)) -> cons1(quote(Y:S),first1(X:S,Z:S)) from(X:S) -> cons(X:S,from(s(X:S))) quote(sel(X:S,Z:S)) -> sel1(X:S,Z:S) quote(0) -> 01 quote(s(X:S)) -> s1(quote(X:S)) quote1(first(X:S,Z:S)) -> first1(X:S,Z:S) quote1(cons(X:S,Z:S)) -> cons1(quote(X:S),quote1(Z:S)) quote1(nil) -> nil1 sel(0,cons(X:S,Z:S)) -> X:S sel(s(X:S),cons(Y:S,Z:S)) -> sel(X:S,Z:S) sel1(0,cons(X:S,Z:S)) -> quote(X:S) sel1(s(X:S),cons(Y:S,Z:S)) -> sel1(X:S,Z:S) unquote(01) -> 0 unquote(s1(X:S)) -> s(unquote(X:S)) unquote1(cons1(X:S,Z:S)) -> fcons(unquote(X:S),unquote1(Z:S)) unquote1(nil1) -> nil -> Pairs in cycle: FROM(X:S) -> FROM(s(X:S)) The problem is infinite.