diff --git a/rs.rkt b/rs.rkt
index 4305687..baaddb0 100644
--- a/rs.rkt
+++ b/rs.rkt
@@ -11,6 +11,7 @@
    reaction->str-triple rs->ht-str-triples
 
    (struct-out state) State dynamics% Dynamics% build-interactive-process-graph
+   build-interactive-process-graph/simple-states
    )
 
   (module+ test
@@ -236,6 +237,23 @@
       (define ctx : (Listof (Setof Species)) (list (set) (set) (set 'x)))
       (check-equal? (graphviz (build-interactive-process-graph rs ctx))
                     "digraph G {\n\tnode0 [label=\"(state (set) '(#<set: x>))\"];\n\tnode1 [label=\"(state (set 'z) '())\"];\n\tnode2 [label=\"(state (set) '(#<set:> #<set: x>))\"];\n\tnode3 [label=\"(state (set) '(#<set:> #<set:> #<set: x>))\"];\n\tsubgraph U {\n\t\tedge [dir=none];\n\t}\n\tsubgraph D {\n\t\tnode0 -> node1 [label=\"'(a)\"];\n\t\tnode2 -> node0 [label=\"'()\"];\n\t\tnode3 -> node2 [label=\"'()\"];\n\t}\n}\n")))
+
+  (: build-interactive-process-graph/simple-states (-> ReactionSystem (Listof (Setof Species)) Graph))
+  (define (build-interactive-process-graph/simple-states rs contexts)
+    (define sgr (build-interactive-process-graph rs contexts))
+    (weighted-graph/directed
+     (for/list ([e (in-edges sgr)])
+       (define u (assert-type (car e) State))
+       (define v (assert-type (cadr e) State))
+       (list (edge-weight sgr u v) (state-result u) (state-result v)))))
+
+  (module+ test
+    (test-case "build-interactive-process-graph/simple-states"
+      (define rs (hash 'a (make-reaction '(x) '(y) '(z))
+                       'b (make-reaction '(x y) '() '(x))))
+      (define ctx : (Listof (Setof Species)) (list (set) (set) (set 'x)))
+      (check-equal? (graphviz (build-interactive-process-graph/simple-states rs ctx))
+                    "digraph G {\n\tnode0 [label=\"(set)\"];\n\tnode1 [label=\"(set 'z)\"];\n\tsubgraph U {\n\t\tedge [dir=none];\n\t\tnode0 -> node0 [label=\"'()\"];\n\t}\n\tsubgraph D {\n\t\tnode0 -> node1 [label=\"'(a)\"];\n\t}\n}\n")))
   )
 
 (require graph "utils.rkt" "generic.rkt")
diff --git a/scribblings/rs.scrbl b/scribblings/rs.scrbl
index 9dc2cc2..5a9d058 100644
--- a/scribblings/rs.scrbl
+++ b/scribblings/rs.scrbl
@@ -269,3 +269,25 @@ that function.
       [ctx : (Listof (Setof Species)) (list (set) (set) (set 'x))])
   (dotit (build-interactive-process-graph rs ctx)))
 ]}
+
+@defproc[(build-interactive-process-graph/simple-states
+         [rs ReactionSystem]
+	 [contexts (Listof (Setof Species))])
+	 Graph]{
+
+Builds the state graph of the reaction system @racket[rs] driven by
+the context sequence @racket[contexts], like
+@racket[build-interactive-process-graph], but omits the context
+sequences from the states.
+
+@bold{Note:} If the reaction system visits the same set of species
+multiple times, all these visits will be conflated into a single node
+in the resulting graph.  The number or the order of visits will not be
+reflected in any way.
+
+@ex[
+(let ([rs (hash 'a (make-reaction '(x) '(y) '(z))
+                'b (make-reaction '(x y) '() '(x)))]
+      [ctx : (Listof (Setof Species)) (list (set) (set) (set 'x))])
+  (dotit (build-interactive-process-graph/simple-states rs ctx)))
+]}