+let get_rule g (r : n_symbol) : rhs =
+ Node.of_int (g.rules.((Node.to_int r) - g.rules_offset))
+
+let get_id1 (r : rhs) : tn_symbol =
+ Node.of_int(((Node.to_int r) lsr 3) land 0x7ffffff)
+
+let get_id2 (r : rhs) : tn_symbol =
+ Node.of_int((Node.to_int r) lsr 30)
+
+type conf = | C0 (* B(C) *)
+ | C1 (* B(C(y0)) *)
+ | C2 (* B(C, y0) *)
+ | C3 (* B(y0, C) *)
+ | C4 (* B(C(y0, y1)) *)
+ | C5 (* B(C(y0), y1) *)
+ | C6 (* B(y0, C(y1)) *)
+
+let get_conf (r : rhs) : conf =
+ (Obj.magic ((Node.to_int r) land 0b111))
+
+
+let get_rank (r : rhs) : int =
+ match get_conf r with
+ | C0 -> 0
+ | C1 | C2 | C3 -> 1
+ | C4 | C5 | C6 -> 2
+
+let get_id1_rank (r : rhs) : int =
+ match get_conf r with
+ | C0 | C1 | C4 -> 1
+ | _ -> 2
+
+let get_id2_pos (r : rhs) : int =
+ match get_conf r with
+ | C0 | C1 |C2 | C4 | C5 -> 1
+ | _ -> 2
+
+let get_id2_rank (r : rhs) : int =
+ match get_conf r with
+ | C0 | C2 | C3 -> 0
+ | C1 | C5 | C6 -> 1
+ | C4 -> 2
+