diff --git a/smop/rules.pl b/smop/rules.pl
index 15b83ead..4970acdf 100644
--- a/smop/rules.pl
+++ b/smop/rules.pl
@@ -1,13 +1,3 @@
-%:- op(800, yfx, =>).
-%:- dynamic =>/2.
-
-%N => 0 :- number(N). 
-%X => 1.
-
-%X*X**0 => X.
-%X**1 => X. 
-%X*X*.*Y => X**(Y+1).
-
 prog([
    nBlocks = matlab_max(matlab_ravel(ai)),
    [m,n] = matlab_size(ai),
@@ -23,27 +13,6 @@
 rewrite([M,N] = matlab_size(A), 
     [M = fortran_size(A,1), N = fortran_size(A,2)]).
 
-/*
-len(A,1) :- atomic(A).
-len(-A,K):- len(A,N), K is N+1.
-len(A+B,K) :- len(A,M),len(B,N),K is M+N+1.
-len(A-B,K) :- len(A,M),len(B,N),K is M+N+1.
-
-A+0 =>  A. 
-0+A =>  A.
-A-0 =>  A.
-0-A => -A.
-%- -A => A. :- len(A,N), writeln(N).
-  -0 => 0. 
- A-A => 0.
--A+A => 0.
-%A+B => C+D :- A => C, B => D.
-%A-B => C-D :- A => C, B => D.
-
-% example
-
-%sin(T)**2+cos(T)**2 => 1.
-*/
 rewrite(A,A) :- atomic(A),!.
 
 rewrite([A|B],[C|D]) :-