diff --git a/tests/vault/gear/test-chain-load-test.cpp b/tests/vault/gear/test-chain-load-test.cpp
index 086a1244d..12a05af8c 100644
--- a/tests/vault/gear/test-chain-load-test.cpp
+++ b/tests/vault/gear/test-chain-load-test.cpp
@@ -38,6 +38,7 @@
 //using lib::time::Time;
 //using lib::time::FSecs;
 
+using util::isnil;
 using util::isSameObject;
 //using lib::test::randStr;
 //using lib::test::randTime;
@@ -87,8 +88,8 @@ namespace test {
           
           Node n0;                                                          // Default-created empty Node
           CHECK (n0.hash == 0);
-          CHECK (n0.pred.size() == DEFAULT_FAN);
-          CHECK (n0.succ.size() == DEFAULT_FAN);
+          CHECK (n0.pred.size() == 0 );
+          CHECK (n0.succ.size() == 0 );
           CHECK (n0.pred == Node::Tab{0});
           CHECK (n0.succ == Node::Tab{0});
           
@@ -143,6 +144,17 @@ namespace test {
           CHECK (n00.hash == 17052526497278249714u);
           n00.calculate();                                                  // calculation is NOT idempotent (inherently statefull)
           CHECK (n00.hash == 13151338213516862912u);
+          
+          CHECK (isnil (n0.succ));
+          CHECK (isnil (n00.succ));
+          CHECK (n00.succ.empty());
+          CHECK (0 == n00.succ.size());
+          CHECK (2 == n00.pred.size());
+          CHECK (2 == n0.pred.size());
+          CHECK (2 == n1.succ.size());
+          CHECK (2 == n2.succ.size());
+          CHECK (isnil (n1.pred));
+          CHECK (isnil (n2.pred));
         }
       
       
diff --git a/tests/vault/gear/test-chain-load.hpp b/tests/vault/gear/test-chain-load.hpp
index b9dd9c770..a6836bc1e 100644
--- a/tests/vault/gear/test-chain-load.hpp
+++ b/tests/vault/gear/test-chain-load.hpp
@@ -80,6 +80,7 @@ namespace test {
 //  using lib::time::Offset;
 //  using lib::meta::RebindVariadic;
 //  using util::isnil;
+  using util::unConst;
 //  using std::forward;
 //  using std::move;
   using boost::hash_combine;
@@ -110,7 +111,30 @@ namespace test {
       struct Node
         : util::MoveOnly
         {
-          using Tab = std::array<Node*, maxFan>;
+          using _Arr = std::array<Node*, maxFan>;
+          using Iter = typename _Arr::iterator;
+          
+          /** Table with connections to other Node records */
+          struct Tab : _Arr
+            {
+              Iter after = _Arr::begin();
+              Iter end() { return after; }
+              friend Iter end(Tab& tab) { return tab.end(); }
+              
+              size_t size() const { return unConst(this)->end()-_Arr::begin(); }
+              bool  empty() const { return 0 == size();     }
+              
+              Iter
+              add(Node& n)
+                {
+                  if (after != _Arr::end())
+                    {
+                      *after = &n;
+                      return after++;
+                    }
+                  NOTREACHED ("excess node linkage");
+                }
+            };
           
           size_t hash;
           Tab pred;
@@ -125,34 +149,16 @@ namespace test {
           Node&
           addPred (Node& other)
             {
-              for (Node*& entry : pred)
-                if (not entry)
-                  {
-                    entry = &other;
-                    for (Node*& backlink : other.succ)
-                      if (not backlink)
-                        {
-                          backlink = this;
-                          return *this;
-                        }
-                  }
+              pred.add(other);
+              other.succ.add(*this);
               NOTREACHED ("excess node linkage");
             }
           
           Node&
           addSucc (Node& other)
             {
-              for (Node*& entry : succ)
-                if (not entry)
-                  {
-                    entry = &other;
-                    for (Node*& backlink : other.pred)
-                      if (not backlink)
-                        {
-                          backlink = this;
-                          return *this;
-                        }
-                  }
+              pred.add(other);
+              other.pred.add(*this);
               NOTREACHED ("excess node linkage");
             }
           
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 53be081a8..720f24816 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -95865,25 +95865,38 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <icon BUILTIN="flag-yellow"/>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1699746891934" ID="ID_1003055056" MODIFIED="1699747555554" TEXT="Node">
-<icon BUILTIN="flag-yellow"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1699746898954" ID="ID_1174327209" MODIFIED="1699747552946" TEXT="Datenstruktur">
-<icon BUILTIN="flag-yellow"/>
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1699746891934" ID="ID_1003055056" MODIFIED="1699803875494" TEXT="Node">
+<icon BUILTIN="pencil"/>
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1699746898954" ID="ID_1174327209" MODIFIED="1699803865847" TEXT="Datenstruktur">
+<icon BUILTIN="pencil"/>
 <node COLOR="#435e98" CREATED="1699746902068" ID="ID_1045369485" MODIFIED="1699754419615" TEXT="maxFan ist ein Template-Param">
 <icon BUILTIN="idea"/>
 </node>
-<node CREATED="1699746922151" ID="ID_292908322" MODIFIED="1699746934836" TEXT="verwende ein std::Array"/>
-<node CREATED="1699747392222" ID="ID_85247310" MODIFIED="1699747397174" TEXT="pred / succ">
-<node CREATED="1699747398919" ID="ID_458723840" MODIFIED="1699747405529" TEXT="Anzahl"/>
-<node CREATED="1699747406121" ID="ID_1825332114" MODIFIED="1699747411156" TEXT="Iteration"/>
+<node COLOR="#338800" CREATED="1699746922151" ID="ID_292908322" MODIFIED="1699803838767" TEXT="verwende std::Array">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#435e98" CREATED="1699747392222" ID="ID_85247310" MODIFIED="1699803842297" TEXT="pred / succ">
+<node COLOR="#338800" CREATED="1699747398919" ID="ID_458723840" MODIFIED="1699803834171" TEXT="Anzahl">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1699747406121" ID="ID_1825332114" MODIFIED="1699803835812" TEXT="Iteration">
+<icon BUILTIN="button_ok"/>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1699747423371" ID="ID_1818811688" MODIFIED="1699747550979" TEXT="Berechnung">
-<icon BUILTIN="flag-yellow"/>
-<node BACKGROUND_COLOR="#f8f1cb" COLOR="#a50125" CREATED="1699747433986" ID="ID_1557543092" MODIFIED="1699747548608" TEXT="setzt Berechnung aller Prefecessors vorraus">
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1699803850765" ID="ID_1046832305" MODIFIED="1699803862199" TEXT="weitere Payload">
+<icon BUILTIN="pencil"/>
+<node COLOR="#338800" CREATED="1699803858055" ID="ID_598864815" MODIFIED="1699803859975" TEXT="hash">
+<icon BUILTIN="button_ok"/>
+</node>
+</node>
+</node>
+<node COLOR="#338800" CREATED="1699747423371" ID="ID_1818811688" MODIFIED="1699803681498" TEXT="Berechnung">
+<icon BUILTIN="button_ok"/>
+<node COLOR="#338800" CREATED="1699747433986" ID="ID_1557543092" MODIFIED="1699803673235" TEXT="setzt Berechnung aller Prefecessors vorraus">
 <icon BUILTIN="messagebox_warning"/>
 </node>
-<node COLOR="#338800" CREATED="1699747511840" ID="ID_96811527" MODIFIED="1699758489537" TEXT="speichert das Ergebnis per Seiteneffekt">
+<node COLOR="#338800" CREATED="1699747511840" ID="ID_96811527" MODIFIED="1699803777983" TEXT="speichert das Ergebnis per Seiteneffekt">
+<linktarget COLOR="#621ebb" DESTINATION="ID_96811527" ENDARROW="Default" ENDINCLINATION="374;25;" ID="Arrow_ID_1925771236" SOURCE="ID_1681365504" STARTARROW="None" STARTINCLINATION="135;10;"/>
 <icon BUILTIN="button_ok"/>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1699747521150" ID="ID_356376425" MODIFIED="1699747533637" TEXT="kann durch Repetitionen aufwendig gemacht werden">
@@ -95892,8 +95905,10 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node COLOR="#435e98" CREATED="1699756460900" ID="ID_1877216077" MODIFIED="1699758391567" TEXT="Implementierung per boost-Hash">
 <icon BUILTIN="yes"/>
 <node CREATED="1699756475850" ID="ID_1420065302" MODIFIED="1699756491156" TEXT="wie &#xfc;blich: weil wesentlich einfacher zu benutzen"/>
-<node CREATED="1699756491632" ID="ID_1814709620" MODIFIED="1699756499051" TEXT="und: Boost bietet bereits hash_combine"/>
-<node BACKGROUND_COLOR="#f8f1cb" COLOR="#a50125" CREATED="1699758395938" ID="ID_1681365504" MODIFIED="1699758441229">
+<node CREATED="1699756491632" ID="ID_1814709620" MODIFIED="1699803797157" TEXT="und: Boost bietet bereits hash_combine">
+<arrowlink COLOR="#ae2a85" DESTINATION="ID_1681365504" ENDARROW="Default" ENDINCLINATION="57;1;" ID="Arrow_ID_167902510" STARTARROW="None" STARTINCLINATION="71;5;"/>
+</node>
+<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1699758395938" ID="ID_1681365504" MODIFIED="1699803799476">
 <richcontent TYPE="NODE"><html>
   <head>
     
@@ -95905,16 +95920,29 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
   </body>
 </html>
 </richcontent>
+<arrowlink COLOR="#621ebb" DESTINATION="ID_96811527" ENDARROW="Default" ENDINCLINATION="374;25;" ID="Arrow_ID_1925771236" STARTARROW="None" STARTINCLINATION="135;10;"/>
+<linktarget COLOR="#ae2a85" DESTINATION="ID_1681365504" ENDARROW="Default" ENDINCLINATION="57;1;" ID="Arrow_ID_167902510" SOURCE="ID_1814709620" STARTARROW="None" STARTINCLINATION="71;5;"/>
 <icon BUILTIN="messagebox_warning"/>
 </node>
 </node>
 </node>
 <node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1699758530360" ID="ID_1331344948" MODIFIED="1699758538983" TEXT="Verlinkung">
 <icon BUILTIN="pencil"/>
-<node BACKGROUND_COLOR="#f0d5c5" COLOR="#990033" CREATED="1699758540245" ID="ID_1948581542" MODIFIED="1699758595139" TEXT="Zahl der Verbindungen implizit codiert">
+<node COLOR="#5b280f" CREATED="1699758540245" ID="ID_1948581542" MODIFIED="1699803614293" TEXT="Zahl der Verbindungen implizit codiert">
 <icon BUILTIN="help"/>
-<node CREATED="1699758599662" ID="ID_475795635" MODIFIED="1699758623119" TEXT="elegant zu coden so"/>
-<node CREATED="1699758626410" ID="ID_254710650" MODIFIED="1699758644732" TEXT="aber nat&#xfc;rlich quadratisch"/>
+<icon BUILTIN="button_cancel"/>
+<node CREATED="1699758599662" ID="ID_475795635" MODIFIED="1699803638799" TEXT="ist erst mal naheliegend (und bequem)">
+<icon BUILTIN="ksmiletris"/>
+</node>
+<node CREATED="1699758626410" ID="ID_254710650" MODIFIED="1699803643433" TEXT="aber nat&#xfc;rlich quadratisch">
+<icon BUILTIN="smiley-oh"/>
+</node>
+<node BACKGROUND_COLOR="#c8c0b6" COLOR="#435e98" CREATED="1699802151220" FOLDED="true" ID="ID_1133520353" MODIFIED="1699803652460" TEXT="eine spezialisierte Klasse w&#xe4;re besser">
+<icon BUILTIN="yes"/>
+<node CREATED="1699802174727" ID="ID_1489941015" MODIFIED="1699802178642" TEXT="baut auf std::array auf"/>
+<node CREATED="1699802179159" ID="ID_1822324287" MODIFIED="1699802196552" TEXT="speichert zus&#xe4;tzlich den Endpunkt-Iterator"/>
+<node CREATED="1699802484022" ID="ID_1587433523" MODIFIED="1699802495258" TEXT="ansonsten so offen wie std::array selber"/>
+</node>
 </node>
 <node COLOR="#338800" CREATED="1699758650056" ID="ID_232473697" MODIFIED="1699758655959" TEXT="Backlinks einf&#xfc;gen">
 <icon BUILTIN="button_ok"/>