diff --git a/graph-lib/graph/__DEBUG_graph5.rkt b/graph-lib/graph/__DEBUG_graph5.rkt
index e274e8bf..7d412d70 100644
--- a/graph-lib/graph/__DEBUG_graph5.rkt
+++ b/graph-lib/graph/__DEBUG_graph5.rkt
@@ -10,7 +10,6 @@
   : (g2 b)
   (error "niy!"))|#
 
-;#|
 #|
 (module mm typed/racket
   (require ;(submod "graph.lp2.rkt" test)
@@ -41,41 +40,36 @@
 (define-graph g2 [a [v : Number] ((ma) (a 1))])
 |#
 
-(require "graph-5-multi-ctors.lp2.rkt")
-(require "../lib/low.rkt"
+(require "graph-5-multi-ctors.lp2.rkt"
+         "../lib/low.rkt"
          "graph.lp2.rkt"
          "get.lp2.rkt"
          "../type-expander/type-expander.lp2.rkt"
-         "../type-expander/multi-id.lp2.rkt")
+         "../type-expander/multi-id.lp2.rkt"
+         (for-syntax syntax/parse))
 
-(define-graph/multi-ctor gm ([a [b1 : b] [b2 : b] [v : Number]]
+(define-graph/multi-ctor gm ([a [b1 : b] [b2 : b] [s : String] [v : Number]]
                              [b [a : a] [s : String] [v : Number]])
-  [(r [v : Number] [w : String])
+  [(r [v : Integer] [w : String])
    : a
-   (a (bx (if (> 0 v) (sub1 v) (+ v (string-length w))))
-      (by (if (> 0 v) (sub1 v) (+ v (string-length w))) "xyz")
+   (printf "r ~a ~a\n" v w)
+   (a (bx (if (> v 0) (sub1 v) (string-length w)))
+      (by (if (> v 0) (sub1 v) (string-length w)) "xyz")
+      w
       v)]
-  [(bx [v : Number])
+  [(bx [v : Integer])
    : b
-   (b (r v) "x" v)]
-  [(by [v : Number] [w : String])
+   (printf "bx ~a\n" v)
+   (b (r v "one") "x" v)]
+  [(by [v : Integer] [w : String])
    : b
-   (b (r v) "y" (+ v (string-length w)))])
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+   (printf "by ~a ~a\n" v w)
+   (b (r v "two") "y" (+ v (string-length w)))])
 
+(define gmi (gm 3 "b"))
+(check-equal?: (get gmi v) 3)
+(check-equal?: (get gmi b1 v) 2)
+(check-equal?: (get gmi b1 s) "x")
+(check-equal?: (get gmi b1 a v) 2)
+;(check-equal?: (get gmi b1 a b1 a v) 1)
+;(check-equal?: (get gmi b1 a b1 a b1 v) 1)
diff --git a/graph-lib/graph/dotlang.rkt b/graph-lib/graph/dotlang.rkt
index 0c0aaced..e53a2aa8 100644
--- a/graph-lib/graph/dotlang.rkt
+++ b/graph-lib/graph/dotlang.rkt
@@ -154,7 +154,7 @@
   (check-equal?: 'aa.….bb.cc.d (list 'get 'aa '… 'bb 'cc 'd))
 
   (check-equal?: 'aa…bb (list 'get 'aa '… 'bb))
-  (check-equal?: 'aa… (slen 2 "a…"))
+  (check-equal?: 'aa… (slen 3 "aa…"))
   
   (check-equal?: '… (slen 1 "…"))
   
diff --git a/graph-lib/graph/fold-queues.lp2.rkt b/graph-lib/graph/fold-queues.lp2.rkt
index 09f20585..386e0f00 100644
--- a/graph-lib/graph/fold-queues.lp2.rkt
+++ b/graph-lib/graph/fold-queues.lp2.rkt
@@ -133,7 +133,7 @@ database type opaque, and use an accessor with signature
          (match q
            [(list h (cons e rest-rs) s i)
             (values e
-                    (list h rest-rs s (assert (- i 1) index?)))]
+                    (list h rest-rs s i #;(assert (- i 1) index?)))]
            [(list h '() s i)
             (Δ-hash2-dequeue (list h (reverse s) '() i))]))]
 
@@ -219,58 +219,6 @@ position in the vector equal to the index associated to it in the hash table:
                                                       Δ-hash2-enqueue)
           (process-queues new-Δ-queues (name/Δ-results-add results result)))]
 
-@subsection{Δ-Hash}
-
-@tc[Δ-Hash] is a type encapsulating both a hash, and a set of key-value pairs
-added to the @tc[Δ-Hash] since its creation from a simple @tc[HashTable].
-
-@chunk[<Δ-hash>
-       (module Δ-hash typed/racket
-         (require "../lib/low.rkt")
-         (define-type (Δ-Hash A B)
-           (Pairof (HashTable A B)
-                   (Setof (Pairof A B))))
-         
-         (: empty-Δ-hash (∀ (K V) (→ (Δ-Hash K V))))
-         (define (empty-Δ-hash)
-           (cons ((inst hash K V)) ((inst set (Pairof K V)))))
-         
-         (: Δ-hash (∀ (K V) (→ (HashTable K V) (Δ-Hash K V))))
-         (define (Δ-hash h)
-           (cons h ((inst set (Pairof K V)))))
-         
-         (: Δ-hash-add (∀ (K V Acc) (→ (Δ-Hash K V)
-                                       K
-                                       Acc
-                                       (→ K Acc (values V Acc))
-                                       (values (Δ-Hash K V)
-                                               Acc))))
-         (define (Δ-hash-add Δ-hash k acc make-v)
-           (if (hash-has-key? (car Δ-hash) k)
-               (values Δ-hash acc)
-               (% v new-acc = (make-v k acc)
-                  (values (cons (hash-set (car Δ-hash) k v)
-                                (set-add (cdr Δ-hash) (cons k v)))
-                          new-acc))))
-         
-         (: Δ-hash-get-Δ (∀ (K V) (→ (Δ-Hash K V) (Setof (Pairof K V)))))
-         (define (Δ-hash-get-Δ Δ-hash) (cdr Δ-hash)))]
-
-@section{@racket{cond-let}}
-
-@CHUNK[<cond-let>
-       (define-syntax (cond-let stx)
-         (syntax-parse stx
-           [(_)
-            #'(typecheck-fail #,stx)]
-           [(_ #:let bindings:expr clause …)
-            #'(let bindings (cond-let clause …))]
-           [(_ [condition:expr (~seq #:else-let binding …) … . body] clause …)
-            #'(if condition
-                  (begin . body)
-                  (let (binding … …)
-                    (cond-let clause …)))]))]
-
 @section{Conclusion}
 
 @chunk[<module-main>
@@ -284,8 +232,6 @@ added to the @tc[Δ-Hash] since its creation from a simple @tc[HashTable].
          
          (provide fold-queues)
          
-         <cond-let>
-         <Δ-hash>
          <fold-queue-multi-sets-immutable-tags>)]
 
 @chunk[<module-test>
diff --git a/graph-lib/graph/graph-5-multi-ctors.lp2.rkt b/graph-lib/graph/graph-5-multi-ctors.lp2.rkt
index 83759a50..3d021f80 100644
--- a/graph-lib/graph/graph-5-multi-ctors.lp2.rkt
+++ b/graph-lib/graph/graph-5-multi-ctors.lp2.rkt
@@ -38,8 +38,11 @@ And @tc[<mapping-declaration>] is:
          (define-temp-ids "~a/mapping" (node …))
          (define-temp-ids "~a/arg" (node …))
          (define-temp-ids "~a/function" (mapping …))
+         (define-temp-ids "~a/placeholder" (mapping …))
          (define-temp-ids "~a/hide" (node …))
          (define-temp-ids "~a/hide" (result-node …))
+         ;(define/with-syntax (result-node/hide …)
+         ;  (cdr-assoc-syntax #'([node . node/hide] …)))
          (define/with-syntax ([(grouped-mapping
                                 grouped-mapping/function
                                 [(grouped-param . grouped-param-type) …]
@@ -53,6 +56,8 @@ And @tc[<mapping-declaration>] is:
                                                result-node
                                                body) …)))
                     #'(node …)))
+         (define/with-syntax ((node/arg↓ …) …)
+           (repeat-stx (node/arg …) ((grouped-mapping …) …)))
          (define/with-syntax (mapping/grouped …)
            (stx-map (λ (mr) (cdr-assoc-syntax mr #'([node . node/mapping] …)))
                     #'(result-node …)))
@@ -65,30 +70,31 @@ And @tc[<mapping-declaration>] is:
          (define/with-syntax ((root-param …) . _) #'((param …) …))
          (define/with-syntax ((root-param-type …) . _) #'((param-type …) …))
          
-         #`(debug
-            (begin
-              (define-graph name/wrapped
-                #:definitions
-                ((define-multi-id name
-                   #:type-expander
-                   (λ (stx)
-                     (syntax-case stx ()
-                       [(_ . rest) #'(name/wrapped . rest)]))
-                   #:call (λ (stx)
-                            (syntax-parse stx
-                              [(_ . rest)
-                               (syntax/loc stx
-                                 (name/constructor . rest))]))
-                   #:id (λ (stx)
-                          (syntax/loc stx name/constructor)))
-                 (define (name/constructor [root-param : root-param-type] …)
-                   (name/wrapped #:root root-node (list 'root-mapping
-                                                        root-param …)))
-                 <define-mappings>)
-                [node [field c field-type] …
-                 ((node/mapping [node/arg : <node-arg-type>])
-                  <mapping-body>)]
-                …))))]
+         (quasitemplate
+          ;(debug
+          (begin
+            (define-graph name/wrapped
+              #:definitions
+              ((define-multi-id name
+                 #:type-expander
+                 (λ (stx)
+                   (syntax-case stx ()
+                     [(_ . rest) #'(name/wrapped . rest)]))
+                 #:call (λ (stx)
+                          (syntax-parse stx
+                            [(_ . rest)
+                             (syntax/loc stx
+                               (name/constructor . rest))]))
+                 #:id (λ (stx)
+                        (syntax/loc stx name/constructor)))
+               (define (name/constructor [root-param : root-param-type] …)
+                 (name/wrapped #:root root-node (list 'root-mapping
+                                                      root-param …)))
+               <define-mappings>)
+              [node [field c field-type] …
+               ((node/mapping [node/arg : <node-arg-type>])
+                <mapping-body>)]
+              …))#|)|#))]
 
 Where the type for the merged mapping is:
 
@@ -96,32 +102,39 @@ Where the type for the merged mapping is:
        (U (List 'grouped-mapping grouped-param-type …) …)]
 
 @chunk[<define-mappings>
-       (define (mapping/function node/hide … ; nodes
-                                 result-node/hide ; self
-                                 [param : param-type] …)
-         : (name result-node)
-         (let ([node node/hide] …)
-           (let ([result-node result-node/hide])
-             (? '<bdy>))))
+       ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+       ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+       (begin
+         (: mapping/placeholder (→ param-type …
+                                   (name/wrapped #:placeholder result-node)))
+         (define (mapping/placeholder param …)
+           ((tmpl-cdr-assoc-syntax result-node [node . node/mapping] …)
+            (list 'mapping param …)))
+         (: mapping/function (→ ;(name/wrapped #:make-placeholder node) …
+                              ;(name/wrapped #:make-incomplete result-node)
+                              param-type …
+                              (name/wrapped #:incomplete result-node)))
+         (define (mapping/function ;node/hide … ; nodes
+                  ;result-node/hide ; self
+                  param …)
+           (let ([result-node/hide result-node])
+             (let ([mapping mapping/placeholder] …)
+               (let ([result-node result-node/hide])
+                 . body)))))
        …]
 
-@chunk[<bdy>
-       (let ([node-names… node_]
-             ;[mapping mapping/grouped] …
-             [node-name_ node_])
-         body)]
-
 We then select in the grouped mapping which one to call.
 
 @chunk[<mapping-body>
-       (let ((a node/arg))
-         (cond
-           [(eq? (car a) 'grouped-mapping)
-            (apply grouped-mapping/function
-                   #,@#'(node …)
-                   grouped-result-node
-                   (cdr a))]
-           …))]
+       ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+       ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+       (cond
+         [(eq? (car node/arg↓) 'grouped-mapping)
+          (apply grouped-mapping/function
+                 ;#,@#'(node …)
+                 ;grouped-result-node
+                 (cdr node/arg↓))]
+         …)]
 
 TODO: At the call site, use a macro and annotate the function (given by its
 name) with the right type, so that the user doesn't see all the types in the
@@ -135,6 +148,7 @@ name) with the right type, so that the user doesn't see all the types in the
 @chunk[<module-main>
        (module main typed/racket
          (require (for-syntax syntax/parse
+                              syntax/parse/experimental/template
                               racket/syntax
                               syntax/stx
                               "../lib/low-untyped.rkt"
diff --git a/graph-lib/graph/graph.lp2.rkt b/graph-lib/graph/graph.lp2.rkt
index d7761ba2..65c54107 100644
--- a/graph-lib/graph/graph.lp2.rkt
+++ b/graph-lib/graph/graph.lp2.rkt
@@ -553,10 +553,16 @@ via @tc[(g Street)].
 @chunk[<graph-type-expander>
        (λ (stx)
          (syntax-parse stx
-           [(_ (~datum node)) #'node/with-promises-type]
-           …
-           [(_ #:incomplete (~datum node)) #'node/incomplete-type]
-           …))]
+           [(_ (~datum node)) #'node/with-promises-type] …
+           [(_ #:incomplete (~datum node)) #'node/incomplete-type] …
+           [(_ #:make-incomplete (~datum node))
+            #'(→ <field/incomplete-type> … node/incomplete-type)] …
+           [(_ #:incomplete (~datum node) fld)
+            (syntax-parse #'fld
+              [(~datum field) #'<field/incomplete-type>] …)] …
+           [(_ #:make-placeholder (~datum node))
+            #'(→ param-type … node/placeholder-type)] …
+           [(_ #:placeholder (~datum node)) #'node/placeholder-type] …))]
 
 We will be able to use this type expander in function types, for example:
 
diff --git a/graph-lib/graph/remember.rkt b/graph-lib/graph/remember.rkt
index ca8c6904..3fc40263 100644
--- a/graph-lib/graph/remember.rkt
+++ b/graph-lib/graph/remember.rkt
@@ -78,3 +78,10 @@
 (structure v w)
 (structure v w)
 (structure v w)
+(structure b1 b2 s v)
+(structure b1 b2 s v)
+(structure b1 b2 s v)
+(structure ab v)
+(structure ba v)
+(structure ab v)
+(structure ab v)
diff --git a/graph-lib/lib/low.rkt b/graph-lib/lib/low.rkt
index 2eca2d1c..ed5cf997 100644
--- a/graph-lib/lib/low.rkt
+++ b/graph-lib/lib/low.rkt
@@ -1423,12 +1423,34 @@
 
 ;; ==== low/typed-not-implemented-yet.rkt ====
 
-(provide ?)
+(provide ? ?*)
+(define-syntax (?* stx)
+  (syntax-case stx ()
+    [(q . rest)
+     (quasisyntax/loc stx
+       ((λ () : (U) #,(syntax/loc #'q (error "Not implemented yet"))
+          . rest)))]))
+
 (define-syntax (? stx)
   (syntax-case stx ()
     [(q t . rest)
      (quasisyntax/loc stx
-       ((λ () : t #,(syntax/loc #'q (error "Not implemented yet"))
-          . rest)))]))
+       ((ann (λ () #,(syntax/loc #'q (error "Not implemented yet"))
+               . rest)
+             (→ t))))]))
+
+;; ==== low/cond-let.rkt ====
+
+(define-syntax (cond-let stx)
+  (syntax-parse stx
+    [(_)
+     #'(typecheck-fail #,stx)]
+    [(_ #:let bindings:expr clause …)
+     #'(let bindings (cond-let clause …))]
+    [(_ [condition:expr (~seq #:else-let binding …) … . body] clause …)
+     #'(if condition
+           (begin . body)
+           (let (binding … …)
+             (cond-let clause …)))]))
 
 ;; ==== end ====
\ No newline at end of file
diff --git a/graph-lib/test/regression/2016-02-02--all-nodes-point-to-root.rkt b/graph-lib/test/regression/2016-02-02--all-nodes-point-to-root.rkt
new file mode 100644
index 00000000..1073a0c5
--- /dev/null
+++ b/graph-lib/test/regression/2016-02-02--all-nodes-point-to-root.rkt
@@ -0,0 +1,35 @@
+#lang typed/racket
+
+(require "../../lib/low.rkt"
+         "../../graph/graph.lp2.rkt"
+         "../../graph/get.lp2.rkt"
+         "../../type-expander/type-expander.lp2.rkt")
+
+(define-graph g2
+  [a [v : Number] [ab : b]
+     ((ma [arga2 : Integer] [arg3 : String])
+      (a arga2 (mb (max 0 (sub1 arga2)))))]
+  [b [v : Number] [ba : a]
+     ((mb [argb2 : Integer])
+      (b argb2 (ma (sub1 argb2) "z")))])
+
+(define gi (g2 3 "b"))
+(check-equal?: (get gi v) 3)
+(check-equal?: (get gi ab v) 2)
+(check-equal?: (get gi ab ba v) 1) ;; should be 1, but was 3 (bug now fixed)
+
+(define-graph g3
+  [a [v : Number] [ab : b]
+     ((ma [arg : (List 'r Integer String)])
+      (a (cadr arg) (mb (list 'b1 (if (> (cadr arg) 0)
+                                      (sub1 (cadr arg))
+                                      (string-length (caddr arg)))))))]
+  [b [v : Number] [ba : a]
+     ((mb [arg : (List 'b1 Integer)])
+      (b (cadr arg) (ma (list 'r (cadr arg) "z"))))])
+
+(define gi3 (g3 (list 'r 3 "b")))
+
+(check-equal?: (get gi3 v) 3)
+(check-equal?: (get gi3 ab v) 2)
+(check-equal?: (get gi3 ab ba v) 2) ;; should be 2, but was 3 (bug now fixed)
\ No newline at end of file