MAYBE
TRS:
 {f(a()) -> f(a()),
     a() -> b()}
 DP:
  Strict:
   {f#(a()) -> f#(a())}
  Weak:
  {f(a()) -> f(a()),
      a() -> b()}
  EDG:
   {(f#(a()) -> f#(a()), f#(a()) -> f#(a()))}
   SCCS:
    Scc:
     {f#(a()) -> f#(a())}
    SCC:
     Strict:
      {f#(a()) -> f#(a())}
     Weak:
     {f(a()) -> f(a()),
         a() -> b()}
     Fail