MAYBE

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

Proof:
 RT Transformation Processor:
  strict:
   a(x1) -> x1
   a(b(x1)) -> c(b(c(b(x1))))
   b(x1) -> a(a(x1))
   c(c(x1)) -> x1
  weak:
   
  Matrix Interpretation Processor:
   dimension: 1
   interpretation:
    [c](x0) = x0 + 1,
    
    [b](x0) = x0 + 16,
    
    [a](x0) = x0 + 20
   orientation:
    a(x1) = x1 + 20 >= x1 = x1
    
    a(b(x1)) = x1 + 36 >= x1 + 34 = c(b(c(b(x1))))
    
    b(x1) = x1 + 16 >= x1 + 40 = a(a(x1))
    
    c(c(x1)) = x1 + 2 >= x1 = x1
   problem:
    strict:
     b(x1) -> a(a(x1))
    weak:
     a(x1) -> x1
     a(b(x1)) -> c(b(c(b(x1))))
     c(c(x1)) -> x1
   Open