MAYBE

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

Proof:
 RT Transformation Processor:
  strict:
   a(a(a(a(x1)))) -> a(c(a(c(c(x1)))))
   c(c(c(x1))) -> a(a(a(x1)))
  weak:
   
  Matrix Interpretation Processor:
   dimension: 1
   interpretation:
    [c](x0) = x0 + 17,
    
    [a](x0) = x0 + 6
   orientation:
    a(a(a(a(x1)))) = x1 + 24 >= x1 + 63 = a(c(a(c(c(x1)))))
    
    c(c(c(x1))) = x1 + 51 >= x1 + 18 = a(a(a(x1)))
   problem:
    strict:
     a(a(a(a(x1)))) -> a(c(a(c(c(x1)))))
    weak:
     c(c(c(x1))) -> a(a(a(x1)))
   Open