diff --git a/src/Test.java b/src/Test.java
index fc156c8..4ee2ff7 100644
--- a/src/Test.java
+++ b/src/Test.java
@@ -13,6 +13,8 @@ import java.io.File;
 import java.util.HashMap;
 import java.util.Map;
 
+import static items.Utils.plot2;
+
 public class Test {
     public static void main(String[] args) throws JsonProcessingException {
         //System.out.println(items.Database.AdaptiveControlUnit);
@@ -73,16 +75,19 @@ public class Test {
 
         plot2(Utils.merge(screws100, computers100), "merged");
 
-    }
+        System.out.println("\n\nPHASE 3");
+        Graph<Item, ProductionEdge> phase3;
+        //phase3 = Utils.sum(Database.VersatileFrameWork, 2500);
+        //phase3 = Utils.merge(phase3, Utils.sum(Database.ModularEngine,500));
+        phase3 = Utils.sum(Database.ModularEngine,5);
+        phase3 = Utils.merge(phase3, Utils.sum(Database.AdaptiveControlUnit, 1));
+
+        plot2(phase3, "phase3");
+        System.out.println("\nrubber");
+        plot2(Utils.sum(Database.Rubber, 75),"rubber");
+        System.out.println("\ntest");
+        Utils.sum(Database.Plastic, 4);
 
-    private static void plot2(Graph<Item, ProductionEdge> sum, String filename) {
-        DOTExporter<Item,ProductionEdge> de = new DOTExporter<>(Item::ID);
-        de.setEdgeAttributeProvider(productionEdge -> {
-            Map<String, Attribute> m = new HashMap<>();
-            m.put("label", DefaultAttribute.createAttribute(productionEdge.label()));
-            return m;
-        });
-        de.exportGraph(sum, new File(filename+".dot"));
     }
 
     private static void plot(Item target, String name, int amount, DOTExporter<Item, DefaultWeightedEdge> de) {
diff --git a/src/items/Database.java b/src/items/Database.java
index d88d0cb..96e42f3 100644
--- a/src/items/Database.java
+++ b/src/items/Database.java
@@ -369,6 +369,9 @@ public class Database {
             Plastic.add(residualPlastic, 2);
 
             Plastic.setPreference(recipe);
+
+            HeavyOilResidue.add(recipe);
+            HeavyOilResidue.setPreference(recipe);
         }
         {
             // Rubber
@@ -382,6 +385,8 @@ public class Database {
             Rubber.add(residualRubber, 2);
 
             Rubber.setPreference(recipe);
+
+            HeavyOilResidue.add(recipe);
         }
         {
             // Petroleum Coke
diff --git a/src/items/Recipe.java b/src/items/Recipe.java
index e09e678..11e479b 100644
--- a/src/items/Recipe.java
+++ b/src/items/Recipe.java
@@ -7,10 +7,7 @@ import org.jgrapht.Graphs;
 import org.jgrapht.graph.DefaultDirectedWeightedGraph;
 import org.jgrapht.graph.DefaultWeightedEdge;
 
-import java.util.HashMap;
-import java.util.LinkedList;
-import java.util.Map;
-import java.util.Queue;
+import java.util.*;
 import java.util.stream.Collectors;
 
 public class Recipe {
@@ -201,9 +198,15 @@ public class Recipe {
                     .forEach(queue::add);
             // *this* item
             double sum = 0;
+            Set<Item> byProducts = new HashSet<>();
             for (DefaultWeightedEdge edge : buildGraph.outgoingEdgesOf(item)) {
                 Item product = buildGraph.getEdgeTarget(edge);
                 Double productWantedPerMinute = map.get(product);
+                if (item.getRecipe().outputs.containsKey(product)){
+                    // product is by-product, no forward dependency
+                    byProducts.add(product);
+                    continue;
+                }
                 if (productWantedPerMinute == null) {
                     sum = 0;
                     break;
@@ -216,11 +219,17 @@ public class Recipe {
 
                 production.addVertex(item);
                 production.addEdge(item, product, new ProductionEdge(item, requiredInput, processesNeeded(item, requiredInput)));
-
             }
             if (!map.containsKey(item) && sum > 0) {
                 map.put(item, sum);
             }
+            if (!byProducts.isEmpty()) {
+                byProducts.forEach(item1 -> {
+                    production.addVertex(item1);
+                    // TODO: calculate produced amount
+                    production.addEdge(item, item1, new ProductionEdge(item, 0,0));
+                });
+            }
         }
         map.forEach((item, aDouble) -> {
             System.out.println(item.getName() + ": " + aDouble);
diff --git a/src/items/Utils.java b/src/items/Utils.java
index 557f30f..8f4d223 100644
--- a/src/items/Utils.java
+++ b/src/items/Utils.java
@@ -1,5 +1,6 @@
 package items;
 
+import items.type.Ore;
 import org.jgrapht.Graph;
 import org.jgrapht.event.ConnectedComponentTraversalEvent;
 import org.jgrapht.event.EdgeTraversalEvent;
@@ -8,9 +9,13 @@ import org.jgrapht.event.VertexTraversalEvent;
 import org.jgrapht.graph.DefaultDirectedWeightedGraph;
 import org.jgrapht.graph.DefaultWeightedEdge;
 import org.jgrapht.graph.EdgeReversedGraph;
+import org.jgrapht.nio.Attribute;
+import org.jgrapht.nio.DefaultAttribute;
+import org.jgrapht.nio.dot.DOTExporter;
 import org.jgrapht.traverse.DepthFirstIterator;
 import org.jgrapht.traverse.GraphIterator;
 
+import java.io.File;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -104,4 +109,25 @@ public class Utils {
         });
         return result;
     }
+
+    public static Graph<Item, ProductionEdge> sum(Item item, int amount) {
+        return item.getRecipe().sum(item,amount);
+    }
+
+    public static void plot2(Graph<Item, ProductionEdge> sum, String filename) {
+        DOTExporter<Item,ProductionEdge> de = new DOTExporter<>(Item::ID);
+        de.setEdgeAttributeProvider(productionEdge -> {
+            Map<String, Attribute> m = new HashMap<>();
+            m.put("label", DefaultAttribute.createAttribute(productionEdge.label()));
+            return m;
+        });
+        de.setVertexAttributeProvider(item -> {
+            Map<String,Attribute> m = new HashMap<>();
+            if (item.isRaw()) {
+                m.put("peripheries", DefaultAttribute.createAttribute(2));
+            }
+            return m;
+        });
+        de.exportGraph(sum, new File(filename+".dot"));
+    }
 }