YES

Problem:
 active(f(f(a()))) -> mark(f(g(f(a()))))
 active(f(X)) -> f(active(X))
 f(mark(X)) -> mark(f(X))
 proper(f(X)) -> f(proper(X))
 proper(a()) -> ok(a())
 proper(g(X)) -> g(proper(X))
 f(ok(X)) -> ok(f(X))
 g(ok(X)) -> ok(g(X))
 top(mark(X)) -> top(proper(X))
 top(ok(X)) -> top(active(X))

Proof:
 DP Processor:
  DPs:
   active#(f(f(a()))) -> g#(f(a()))
   active#(f(f(a()))) -> f#(g(f(a())))
   active#(f(X)) -> active#(X)
   active#(f(X)) -> f#(active(X))
   f#(mark(X)) -> f#(X)
   proper#(f(X)) -> proper#(X)
   proper#(f(X)) -> f#(proper(X))
   proper#(g(X)) -> proper#(X)
   proper#(g(X)) -> g#(proper(X))
   f#(ok(X)) -> f#(X)
   g#(ok(X)) -> g#(X)
   top#(mark(X)) -> proper#(X)
   top#(mark(X)) -> top#(proper(X))
   top#(ok(X)) -> active#(X)
   top#(ok(X)) -> top#(active(X))
  TRS:
   active(f(f(a()))) -> mark(f(g(f(a()))))
   active(f(X)) -> f(active(X))
   f(mark(X)) -> mark(f(X))
   proper(f(X)) -> f(proper(X))
   proper(a()) -> ok(a())
   proper(g(X)) -> g(proper(X))
   f(ok(X)) -> ok(f(X))
   g(ok(X)) -> ok(g(X))
   top(mark(X)) -> top(proper(X))
   top(ok(X)) -> top(active(X))
  Usable Rule Processor:
   DPs:
    active#(f(f(a()))) -> g#(f(a()))
    active#(f(f(a()))) -> f#(g(f(a())))
    active#(f(X)) -> active#(X)
    active#(f(X)) -> f#(active(X))
    f#(mark(X)) -> f#(X)
    proper#(f(X)) -> proper#(X)
    proper#(f(X)) -> f#(proper(X))
    proper#(g(X)) -> proper#(X)
    proper#(g(X)) -> g#(proper(X))
    f#(ok(X)) -> f#(X)
    g#(ok(X)) -> g#(X)
    top#(mark(X)) -> proper#(X)
    top#(mark(X)) -> top#(proper(X))
    top#(ok(X)) -> active#(X)
    top#(ok(X)) -> top#(active(X))
   TRS:
    active(f(f(a()))) -> mark(f(g(f(a()))))
    active(f(X)) -> f(active(X))
    f(mark(X)) -> mark(f(X))
    f(ok(X)) -> ok(f(X))
    proper(f(X)) -> f(proper(X))
    proper(a()) -> ok(a())
    proper(g(X)) -> g(proper(X))
    g(ok(X)) -> ok(g(X))
   Matrix Interpretation Processor: dim=2
    
    usable rules:
     active(f(f(a()))) -> mark(f(g(f(a()))))
     active(f(X)) -> f(active(X))
     f(mark(X)) -> mark(f(X))
     f(ok(X)) -> ok(f(X))
     proper(f(X)) -> f(proper(X))
     proper(a()) -> ok(a())
     proper(g(X)) -> g(proper(X))
     g(ok(X)) -> ok(g(X))
    interpretation:
     [top#](x0) = [1 2]x0,
     
     [proper#](x0) = [1 1]x0 + [3],
     
     [f#](x0) = [1 2]x0,
     
     [g#](x0) = [1 1]x0,
     
     [active#](x0) = [0 1]x0 + [1],
     
                     [3]
     [ok](x0) = x0 + [0],
     
                         [3]
     [proper](x0) = x0 + [0],
     
                       [0]
     [mark](x0) = x0 + [2],
     
               [1 1]     [0]
     [g](x0) = [0 0]x0 + [1],
     
                    [0 0]     [2]
     [active](x0) = [0 1]x0 + [0],
     
               [1 0]     [0]
     [f](x0) = [0 2]x0 + [2],
     
           [0]
     [a] = [0]
    orientation:
     active#(f(f(a()))) = 7 >= 2 = g#(f(a()))
     
     active#(f(f(a()))) = 7 >= 4 = f#(g(f(a())))
     
     active#(f(X)) = [0 2]X + [3] >= [0 1]X + [1] = active#(X)
     
     active#(f(X)) = [0 2]X + [3] >= [0 2]X + [2] = f#(active(X))
     
     f#(mark(X)) = [1 2]X + [4] >= [1 2]X = f#(X)
     
     proper#(f(X)) = [1 2]X + [5] >= [1 1]X + [3] = proper#(X)
     
     proper#(f(X)) = [1 2]X + [5] >= [1 2]X + [3] = f#(proper(X))
     
     proper#(g(X)) = [1 1]X + [4] >= [1 1]X + [3] = proper#(X)
     
     proper#(g(X)) = [1 1]X + [4] >= [1 1]X + [3] = g#(proper(X))
     
     f#(ok(X)) = [1 2]X + [3] >= [1 2]X = f#(X)
     
     g#(ok(X)) = [1 1]X + [3] >= [1 1]X = g#(X)
     
     top#(mark(X)) = [1 2]X + [4] >= [1 1]X + [3] = proper#(X)
     
     top#(mark(X)) = [1 2]X + [4] >= [1 2]X + [3] = top#(proper(X))
     
     top#(ok(X)) = [1 2]X + [3] >= [0 1]X + [1] = active#(X)
     
     top#(ok(X)) = [1 2]X + [3] >= [0 2]X + [2] = top#(active(X))
     
                         [2]    [2]                     
     active(f(f(a()))) = [6] >= [6] = mark(f(g(f(a()))))
     
                    [0 0]    [2]    [0 0]    [2]               
     active(f(X)) = [0 2]X + [2] >= [0 2]X + [2] = f(active(X))
     
                  [1 0]    [0]    [1 0]    [0]             
     f(mark(X)) = [0 2]X + [6] >= [0 2]X + [4] = mark(f(X))
     
                [1 0]    [3]    [1 0]    [3]           
     f(ok(X)) = [0 2]X + [2] >= [0 2]X + [2] = ok(f(X))
     
                    [1 0]    [3]    [1 0]    [3]               
     proper(f(X)) = [0 2]X + [2] >= [0 2]X + [2] = f(proper(X))
     
                   [3]    [3]          
     proper(a()) = [0] >= [0] = ok(a())
     
                    [1 1]    [3]    [1 1]    [3]               
     proper(g(X)) = [0 0]X + [1] >= [0 0]X + [1] = g(proper(X))
     
                [1 1]    [3]    [1 1]    [3]           
     g(ok(X)) = [0 0]X + [1] >= [0 0]X + [1] = ok(g(X))
    problem:
     DPs:
      
     TRS:
      active(f(f(a()))) -> mark(f(g(f(a()))))
      active(f(X)) -> f(active(X))
      f(mark(X)) -> mark(f(X))
      f(ok(X)) -> ok(f(X))
      proper(f(X)) -> f(proper(X))
      proper(a()) -> ok(a())
      proper(g(X)) -> g(proper(X))
      g(ok(X)) -> ok(g(X))
    Qed