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The given Problem was:
b b b -> a a 
a a -> b a b 
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A self-embedding rewrite structure for the given SRS is:
   a a b b a b b a --(6)-> b a a b b a b b a b (#168)
   OC+OC at 7
      OC: a a b b a b b --(5)-> b a a b b a b a (#46)
          OC+OC at 2
             OC: a a --(1)-> b a b (#2)
                 Rule
             OC: b b b a b b --(4)-> a b b a b a (#20)
                 OC+OC at 1
                    OC: b b b --(1)-> a a (#1)
                        Rule
                    OC: a a b b --(3)-> b b a b a (#12)
                        OC+OC at 1
                           OC: a a b b --(2)-> b a a a (#3)
                               OC+OC at 2
                                  OC: a a --(1)-> b a b (#2)
                                      Rule
                                  OC: b b b --(1)-> a a (#1)
                                      Rule
                           OC: a a --(1)-> b a b (#2)
                               Rule
      OC: a a --(1)-> b a b (#2)
          Rule
Hence, the SRS is non-terminating.