YES (VAR x0 x1 x) (RULES f(x0,nil()) -> nil() g(x0,x1) -> x0 cdr(nil()) -> nil() cons(x,nil()) -> x ) (COMMENT Termination is shown by ELPO with interpretations on natural numbers f_A(x1,x2) = x2 + 35102 nil_A = 1 g_A(x1,x2) = x1 + 35104 cdr_A(x1) = x1 + 35105 cons_A(x1,x2) = x1 + x2 + 1 f#_A(x1,x2) = 0 nil#_A = 0 g#_A(x1,x2) = x1 cdr#_A(x1) = x1 cons#_A(x1,x2) = x1 + x2 and precedence: cdr > g > f > cons > nil )