MAYBE

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

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