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diff --git a/etc/coq/xsymboltest.v b/etc/coq/xsymboltest.v
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+(* Grammar for symbols:
+  a symbol is encoded only if 
+   - preceded by _ or some space or some symbol
+  **and**
+   - followed by _ or some space or some symbol
+
+  Grammar for sub/superscript: 
+
+   - a double _ introduces a subscript that ends at the first space
+   - a double ^ introduces a superscript that ends at the first space
+  
+   - a _ followed by { introduces a subscript
+     expression that ends at the first }
+   - a ^ followed by { introduces a superscript
+     expression that ends at the first }
+ *)
+
+
+
+foo_alpha_1_beta_3  (* this should appear like foo_a_1_B_3 where a and B are greek *)
+delta__1 delta^^1          (* greek delta with a sub 1 and the same with super 1 *)
+x_{a+b} x^{a+b}         (* x with a+b subscripted and then superscripted *)
+philosophi   (* no greek letter should appear on this line *)
+aalpha alphaa (* no greek letter *)
+_alpha           (* _a where a is greek *)
+alpha_           (* a_ where a is greek *)
+
+
+
+Fixpoint toto (x:nat) {struct x} : nat := (* nat should appear as |N *)
+  match x with
+    | O => O        (* double arrow here *)
+    | S y => toto y (* double arrow here *)
+  end.
+
+Lemma titi : forall x:nat,x=x. (* symbolique for-all and nat *)
+ 
\ No newline at end of file