YES

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

Proof:
 DP Processor:
  DPs:
   a#(c(x1)) -> a#(x1)
   a#(c(x1)) -> b#(a(x1))
   b#(c(x1)) -> b#(x1)
   b#(c(x1)) -> a#(b(x1))
  TRS:
   a(b(x1)) -> x1
   a(c(x1)) -> c(c(b(a(x1))))
   b(c(x1)) -> a(b(x1))
  TDG Processor:
   DPs:
    a#(c(x1)) -> a#(x1)
    a#(c(x1)) -> b#(a(x1))
    b#(c(x1)) -> b#(x1)
    b#(c(x1)) -> a#(b(x1))
   TRS:
    a(b(x1)) -> x1
    a(c(x1)) -> c(c(b(a(x1))))
    b(c(x1)) -> a(b(x1))
   graph:
    b#(c(x1)) -> b#(x1) -> b#(c(x1)) -> a#(b(x1))
    b#(c(x1)) -> b#(x1) -> b#(c(x1)) -> b#(x1)
    b#(c(x1)) -> a#(b(x1)) -> a#(c(x1)) -> b#(a(x1))
    b#(c(x1)) -> a#(b(x1)) -> a#(c(x1)) -> a#(x1)
    a#(c(x1)) -> b#(a(x1)) -> b#(c(x1)) -> a#(b(x1))
    a#(c(x1)) -> b#(a(x1)) -> b#(c(x1)) -> b#(x1)
    a#(c(x1)) -> a#(x1) -> a#(c(x1)) -> b#(a(x1))
    a#(c(x1)) -> a#(x1) -> a#(c(x1)) -> a#(x1)
   Arctic Interpretation Processor:
    dimension: 1
    usable rules:
     a(b(x1)) -> x1
     a(c(x1)) -> c(c(b(a(x1))))
     b(c(x1)) -> a(b(x1))
    interpretation:
     [b#](x0) = x0 + -16,
     
     [a](x0) = 3x0 + -16,
     
     [a#](x0) = x0 + 0,
     
     [b](x0) = -3x0 + 0,
     
     [c](x0) = 3x0 + 9
    orientation:
     a#(c(x1)) = 3x1 + 9 >= x1 + 0 = a#(x1)
     
     a#(c(x1)) = 3x1 + 9 >= 3x1 + -16 = b#(a(x1))
     
     b#(c(x1)) = 3x1 + 9 >= x1 + -16 = b#(x1)
     
     b#(c(x1)) = 3x1 + 9 >= -3x1 + 0 = a#(b(x1))
     
     a(b(x1)) = x1 + 3 >= x1 = x1
     
     a(c(x1)) = 6x1 + 12 >= 6x1 + 12 = c(c(b(a(x1))))
     
     b(c(x1)) = x1 + 6 >= x1 + 3 = a(b(x1))
    problem:
     DPs:
      a#(c(x1)) -> b#(a(x1))
     TRS:
      a(b(x1)) -> x1
      a(c(x1)) -> c(c(b(a(x1))))
      b(c(x1)) -> a(b(x1))
    Restore Modifier:
     DPs:
      a#(c(x1)) -> b#(a(x1))
     TRS:
      a(b(x1)) -> x1
      a(c(x1)) -> c(c(b(a(x1))))
      b(c(x1)) -> a(b(x1))
     EDG Processor:
      DPs:
       a#(c(x1)) -> b#(a(x1))
      TRS:
       a(b(x1)) -> x1
       a(c(x1)) -> c(c(b(a(x1))))
       b(c(x1)) -> a(b(x1))
      graph:
       
      SCC Processor:
       #sccs: 0
       #rules: 0
       #arcs: 0/1