diff --git a/ocaml/Resolution.ml b/ocaml/Resolution.ml
index a9cc242..031e220 100644
--- a/ocaml/Resolution.ml
+++ b/ocaml/Resolution.ml
@@ -92,6 +92,9 @@ let print_dgraph dg =
     | h::t -> (link_to_string h) ^ "\n" ^ aux t 
   in print_string (aux dg);;
 
+let clean_dgraph g =
+  List.filter (fun a -> a <> []) g
+
 (* _________ Examples _________ *)
 let make_const_pol pol c = Func (c, pol, [])
 let make_const c = make_const_pol Npol c
@@ -149,11 +152,42 @@ let exec2 graph const =
           | (_,(None,_)) -> None
           in aux2 h sol
     in aux graph (Some [],[]) ;;
-  
 
-exec (dgraph constellation) constellation;;
-exec2 (dgraph constellation) constellation;;
+(* token is a couple of a family number and a star number in the constellation *)
+type token = int * int
+type process = token list
+
+(* get a star using its number in the list from a constellation *)
+let get_star i const =
+  List.nth const i
+
+(* takes a token, a graph and a constellation and returns the list of tokens to check next and a list of solvable equation *)
+let divide_token (fam, n_star) graph const =
+  let rec aux g toklist prob =
+    match g with
+    | [] -> Some (toklist,prob)
+    | h::t -> let links = List.filter (fun ((i, _),(_, _)) -> i = n_star) h in
+        let rec aux2 l tokl probb =
+          match l with
+          | [] -> Some (toklist,prob)
+          | ((i, j),(ri,rj))::tl -> 
+              if Option.is_some (solve ((ray_to_term (inv_pol_ray ri), ray_to_term rj)::probb) []) then 
+                aux2 tl ((fam, j)::tokl) ((ray_to_term (inv_pol_ray ri), ray_to_term rj)::probb) 
+              else None
+        in if links = [] then aux t toklist prob else aux2 links toklist prob
+  in aux graph [] []
+
+(* should be deterministic exec, graph shouldn't be empty *)
+let exec const =
+  let graph = clean_dgraph (dgraph const) in
+  let rec aux (toklist,prob) =
+    begin match toklist with
+      | [] -> prob
+      | h::t -> aux (Option.get (divide_token h graph const))
+    end              
+  in let ((i,_),(_,_)) = (List.hd (List.hd graph)) in aux ([(0,i)],[])
 
 (* test constellation cyclique déterministe *)
-let boucle = [ [Func("c", Neg, [x]); x] ; [Func("c", Pos, [Func("f", Npol, [y])]) ; Func("c", Npol, [x]) ] ] ;;
-print_dgraph (dgraph boucle);;
\ No newline at end of file
+let test = [ [Func("c", Neg, [x]); x] ; [Func("c", Pos, [Func("f", Npol, [y])]) ; Func("c", Npol, [x]) ] ] ;;
+print_dgraph (dgraph test);;
+exec test ;;
\ No newline at end of file