MAYBE
Time: 0.000478
TRS:
 {   from X -> cons X,
   length() -> 0(),
   length() -> s length1(),
  length1() -> length()}
 DP:
  DP:
   { length#() -> length1#(),
    length1#() -> length#()}
  TRS:
  {   from X -> cons X,
    length() -> 0(),
    length() -> s length1(),
   length1() -> length()}
  UR:
   {}
   EDG:
    {(length1#() -> length#(), length#() -> length1#())
     (length#() -> length1#(), length1#() -> length#())}
    STATUS:
     arrows: 0.500000
     SCCS (1):
      Scc:
       { length#() -> length1#(),
        length1#() -> length#()}
      
      SCC (2):
       Strict:
        { length#() -> length1#(),
         length1#() -> length#()}
       Weak:
       {   from X -> cons X,
         length() -> 0(),
         length() -> s length1(),
        length1() -> length()}
       Open