(ignored inputs)COMMENT Example 3.4.23 of \cite{Gra96thesis}
Rewrite Rules:
   [ f(a) -> b,
     f(a) -> f(c),
     a -> d,
     f(d) -> b,
     f(c) -> b,
     d -> c ]
Apply Direct Methods...
Inner CPs:
   [ f(d) = b,
     f(d) = f(c),
     f(c) = b ]
Outer CPs:
   [ b = f(c) ]
not Overlay, check Termination...
Terminating, WCR
Knuth&Bendix
Direct Methods: CR

Final result: CR
/local-scratch/hzankl/2012/cops2012/40.trs: Success(CR)
(0 msec.)