YES

Problem:
 fst(0(),Z) -> nil()
 fst(s(X),cons(Y,Z)) -> cons(Y,n__fst(activate(X),activate(Z)))
 from(X) -> cons(X,n__from(s(X)))
 add(0(),X) -> X
 add(s(X),Y) -> s(n__add(activate(X),Y))
 len(nil()) -> 0()
 len(cons(X,Z)) -> s(n__len(activate(Z)))
 fst(X1,X2) -> n__fst(X1,X2)
 from(X) -> n__from(X)
 add(X1,X2) -> n__add(X1,X2)
 len(X) -> n__len(X)
 activate(n__fst(X1,X2)) -> fst(X1,X2)
 activate(n__from(X)) -> from(X)
 activate(n__add(X1,X2)) -> add(X1,X2)
 activate(n__len(X)) -> len(X)
 activate(X) -> X

Proof:
 Matrix Interpretation Processor: dim=1
  
  interpretation:
   [n__len](x0) = x0,
   
   [len](x0) = 4x0 + 3,
   
   [n__add](x0, x1) = x0 + x1,
   
   [add](x0, x1) = 4x0 + x1 + 3,
   
   [n__from](x0) = x0 + 1,
   
   [from](x0) = 2x0 + 6,
   
   [n__fst](x0, x1) = x0 + x1 + 2,
   
   [activate](x0) = 4x0 + 3,
   
   [cons](x0, x1) = x0 + x1 + 4,
   
   [s](x0) = x0 + 1,
   
   [nil] = 0,
   
   [fst](x0, x1) = 4x0 + 4x1 + 2,
   
   [0] = 0
  orientation:
   fst(0(),Z) = 4Z + 2 >= 0 = nil()
   
   fst(s(X),cons(Y,Z)) = 4X + 4Y + 4Z + 22 >= 4X + Y + 4Z + 12 = cons(Y,n__fst(activate(X),activate(Z)))
   
   from(X) = 2X + 6 >= 2X + 6 = cons(X,n__from(s(X)))
   
   add(0(),X) = X + 3 >= X = X
   
   add(s(X),Y) = 4X + Y + 7 >= 4X + Y + 4 = s(n__add(activate(X),Y))
   
   len(nil()) = 3 >= 0 = 0()
   
   len(cons(X,Z)) = 4X + 4Z + 19 >= 4Z + 4 = s(n__len(activate(Z)))
   
   fst(X1,X2) = 4X1 + 4X2 + 2 >= X1 + X2 + 2 = n__fst(X1,X2)
   
   from(X) = 2X + 6 >= X + 1 = n__from(X)
   
   add(X1,X2) = 4X1 + X2 + 3 >= X1 + X2 = n__add(X1,X2)
   
   len(X) = 4X + 3 >= X = n__len(X)
   
   activate(n__fst(X1,X2)) = 4X1 + 4X2 + 11 >= 4X1 + 4X2 + 2 = fst(X1,X2)
   
   activate(n__from(X)) = 4X + 7 >= 2X + 6 = from(X)
   
   activate(n__add(X1,X2)) = 4X1 + 4X2 + 3 >= 4X1 + X2 + 3 = add(X1,X2)
   
   activate(n__len(X)) = 4X + 3 >= 4X + 3 = len(X)
   
   activate(X) = 4X + 3 >= X = X
  problem:
   from(X) -> cons(X,n__from(s(X)))
   fst(X1,X2) -> n__fst(X1,X2)
   activate(n__add(X1,X2)) -> add(X1,X2)
   activate(n__len(X)) -> len(X)
  Matrix Interpretation Processor: dim=1
   
   interpretation:
    [n__len](x0) = x0,
    
    [len](x0) = x0,
    
    [n__add](x0, x1) = 4x0 + x1,
    
    [add](x0, x1) = x0 + x1 + 2,
    
    [n__from](x0) = x0,
    
    [from](x0) = 2x0,
    
    [n__fst](x0, x1) = x0 + 4x1,
    
    [activate](x0) = x0 + 2,
    
    [cons](x0, x1) = x0 + x1,
    
    [s](x0) = x0,
    
    [fst](x0, x1) = x0 + 6x1 + 4
   orientation:
    from(X) = 2X >= 2X = cons(X,n__from(s(X)))
    
    fst(X1,X2) = X1 + 6X2 + 4 >= X1 + 4X2 = n__fst(X1,X2)
    
    activate(n__add(X1,X2)) = 4X1 + X2 + 2 >= X1 + X2 + 2 = add(X1,X2)
    
    activate(n__len(X)) = X + 2 >= X = len(X)
   problem:
    from(X) -> cons(X,n__from(s(X)))
    activate(n__add(X1,X2)) -> add(X1,X2)
   Matrix Interpretation Processor: dim=1
    
    interpretation:
     [n__add](x0, x1) = 4x0 + 4x1 + 3,
     
     [add](x0, x1) = 2x0 + 4x1,
     
     [n__from](x0) = x0,
     
     [from](x0) = 7x0,
     
     [activate](x0) = 7x0 + 3,
     
     [cons](x0, x1) = x0 + x1,
     
     [s](x0) = 6x0
    orientation:
     from(X) = 7X >= 7X = cons(X,n__from(s(X)))
     
     activate(n__add(X1,X2)) = 28X1 + 28X2 + 24 >= 2X1 + 4X2 = add(X1,X2)
    problem:
     from(X) -> cons(X,n__from(s(X)))
    Matrix Interpretation Processor: dim=1
     
     interpretation:
      [n__from](x0) = x0 + 1,
      
      [from](x0) = 5x0 + 5,
      
      [cons](x0, x1) = x0 + 4x1,
      
      [s](x0) = x0
     orientation:
      from(X) = 5X + 5 >= 5X + 4 = cons(X,n__from(s(X)))
     problem:
      
     Qed