MAYBE

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

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