MAYBE

Problem:
 b(b(b(a(b(x1))))) -> b(a(b(b(a(b(x1))))))
 b(a(b(b(x1)))) -> b(b(a(b(a(b(x1))))))
 b(a(b(a(a(b(b(x1))))))) -> b(a(a(b(a(a(b(b(b(a(b(x1)))))))))))

Proof:
 Complexity Transformation Processor:
  strict:
   b(b(b(a(b(x1))))) -> b(a(b(b(a(b(x1))))))
   b(a(b(b(x1)))) -> b(b(a(b(a(b(x1))))))
   b(a(b(a(a(b(b(x1))))))) -> b(a(a(b(a(a(b(b(b(a(b(x1)))))))))))
  weak:
   
  Open