(ignored inputs)COMMENT Exercise 6.17 of \cite{BN98}
Rewrite Rules:
   [ or(true,true) -> true,
     or(?x,?y) -> or(?y,?x) ]
Apply Direct Methods...
Inner CPs:
   [  ]
Outer CPs:
   [ true = or(true,true) ]
Overlay, check Innermost Termination...
unknown Innermost Terminating
unknown Knuth&Bendix
Linear
Development Closed
Direct Methods: CR

Final result: CR
/local-scratch/hzankl/2012/cops2012/4.trs: Success(CR)
(0 msec.)