diff --git a/Opdracht_4/inc/Machine.h b/Opdracht_4/inc/Machine.h
index 5107d35..a4e2797 100644
--- a/Opdracht_4/inc/Machine.h
+++ b/Opdracht_4/inc/Machine.h
@@ -10,6 +10,7 @@ class Machine {
         Motor* m1;
         Motor* m2;
     public:
+        virtual ~Machine(){};
         virtual Motor* motor1() = 0;
         virtual Motor* motor2() = 0;
         virtual void run() = 0;
diff --git a/Opdracht_4/inc/MachineImpl.h b/Opdracht_4/inc/MachineImpl.h
index c22e93b..ea30bf3 100644
--- a/Opdracht_4/inc/MachineImpl.h
+++ b/Opdracht_4/inc/MachineImpl.h
@@ -14,7 +14,6 @@ class MachineImpl : public Machine
         Motor* m2;
     public:
         MachineImpl(Motor*,Motor*);
-        ~MachineImpl(){};
         virtual Motor* motor1();
         virtual Motor* motor2();
         virtual void run();
diff --git a/Opdracht_4/inc/TsensorImpl.h b/Opdracht_4/inc/TsensorImpl.h
index 3d48681..fbb4035 100644
--- a/Opdracht_4/inc/TsensorImpl.h
+++ b/Opdracht_4/inc/TsensorImpl.h
@@ -9,7 +9,6 @@ class TsensorImpl : public Tsensor, public Subject{
         int temperatuur;
     public:
         TsensorImpl();
-        virtual ~TsensorImpl(){};
         virtual void read();
         virtual int temperature();
 };
diff --git a/Opdracht_4/opdracht4.drawio b/Opdracht_4/opdracht4.drawio
index d2a301f..cf2c9b6 100644
--- a/Opdracht_4/opdracht4.drawio
+++ b/Opdracht_4/opdracht4.drawio
@@ -1,88 +1,140 @@
 <mxfile host="65bd71144e">
     <diagram id="KfANXQmF8nHkjfM11mp0" name="Page-1">
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+        <mxGraphModel dx="2715" dy="2184" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="850" pageHeight="1100" math="0" shadow="0">
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-                    <mxGeometry x="350" y="750" width="950" height="430" as="geometry"/>
+                    <mxGeometry x="270" y="750" width="1508" height="430" as="geometry"/>
                 </mxCell>
                 <mxCell id="2" value="" style="rounded=0;whiteSpace=wrap;html=1;fillColor=#D882C7;strokeColor=none;fontColor=#ffffff;" parent="1" vertex="1">
-                    <mxGeometry y="100" width="360" height="1080" as="geometry"/>
+                    <mxGeometry y="100" width="270" height="1080" as="geometry"/>
                 </mxCell>
                 <mxCell id="3" value="&lt;font style=&quot;font-size: 16px;&quot;&gt;Infrastructure Layer&lt;/font&gt;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
-                    <mxGeometry x="120" y="100" width="160" height="30" as="geometry"/>
+                    <mxGeometry x="10" y="100" width="160" height="30" as="geometry"/>
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                 <mxCell id="30" value="" style="rounded=0;whiteSpace=wrap;html=1;labelBackgroundColor=#d1d1d2;strokeColor=#B37524;fontSize=16;fillColor=#FF944D;fontColor=#ffffff;gradientColor=none;" parent="1" vertex="1">
-                    <mxGeometry x="360" y="100" width="940" height="210" as="geometry"/>
+                    <mxGeometry x="270" y="100" width="1508" height="210" as="geometry"/>
                 </mxCell>
                 <mxCell id="31" value="&lt;font style=&quot;font-size: 16px;&quot;&gt;Interface Layer&lt;/font&gt;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
-                    <mxGeometry x="375" y="100" width="130" height="30" as="geometry"/>
+                    <mxGeometry x="270" y="100" width="130" height="30" as="geometry"/>
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-                    <mxGeometry x="360" y="310" width="940" height="440" as="geometry"/>
+                    <mxGeometry x="270" y="310" width="1508" height="440" as="geometry"/>
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                 <mxCell id="36" value="&lt;font style=&quot;font-size: 16px;&quot;&gt;Domain Implementatie Layer&lt;/font&gt;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
-                    <mxGeometry x="360" y="320" width="230" height="30" as="geometry"/>
+                    <mxGeometry x="260" y="315" width="230" height="30" as="geometry"/>
                 </mxCell>
                 <mxCell id="66" value="&lt;span style=&quot;font-size: 16px;&quot;&gt;Domain&amp;nbsp;Layer&lt;br&gt;&lt;/span&gt;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
-                    <mxGeometry x="350" y="750" width="120" height="30" as="geometry"/>
+                    <mxGeometry x="330" y="750" width="120" height="30" as="geometry"/>
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                 <mxCell id="144" value="" style="shape=partialRectangle;html=1;whiteSpace=wrap;connectable=0;fillColor=none;top=0;left=0;bottom=0;right=0;overflow=hidden;" parent="1" vertex="1">
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+                    <mxGeometry x="128" y="1530" width="147" height="73" as="geometry">
                         <mxRectangle width="147" height="73" as="alternateBounds"/>
                     </mxGeometry>
                 </mxCell>
-                <mxCell id="125" value="" style="rounded=0;whiteSpace=wrap;html=1;fillColor=none;" parent="1" vertex="1">
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+                <mxCell id="125" value="" style="rounded=0;whiteSpace=wrap;html=1;fillColor=none;" vertex="1" parent="1">
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                     <mxGeometry width="50" height="50" relative="1" as="geometry">
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+                        <mxPoint x="718" y="260" as="sourcePoint"/>
+                        <mxPoint x="642.2000000000003" y="416.35000000000014" as="targetPoint"/>
                         <Array as="points">
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-                            <mxPoint x="751" y="445"/>
-                            <mxPoint x="740" y="445"/>
-                            <mxPoint x="751" y="465"/>
+                            <mxPoint x="718" y="320"/>
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+                            <mxPoint x="819" y="445"/>
+                            <mxPoint x="808" y="445"/>
+                            <mxPoint x="819" y="465"/>
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+                        <mxPoint x="748" y="260" as="sourcePoint"/>
+                        <mxPoint x="728" y="539" as="targetPoint"/>
                         <Array as="points">
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+                </mxCell>
+                <mxCell id="291" value="&lt;div style=&quot;text-align: left;&quot;&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;cout &amp;lt;&amp;lt; &quot;Voer een temperatuur in: &quot;&lt;/span&gt;&lt;/div&gt;&lt;div style=&quot;text-align: left;&quot;&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;cin &amp;gt;&amp;gt; temperatuur&lt;/span&gt;&lt;/div&gt;&lt;div style=&quot;text-align: left;&quot;&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;cout &amp;lt;&amp;lt; endl&lt;/span&gt;&lt;/div&gt;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
+                    <mxGeometry x="1470" y="480" width="210" height="60" as="geometry"/>
+                </mxCell>
+                <mxCell id="293" value="return t1" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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+                </mxCell>
+                <mxCell id="296" value="cout &amp;lt;&amp;lt; &quot;Elektrische motor has started&quot;&amp;nbsp;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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+                    <mxGeometry x="680" y="610" width="260" height="30" as="geometry"/>
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+                <mxCell id="304" value="&amp;nbsp; &amp;nbsp; &amp;nbsp; cout &amp;lt;&amp;lt; &quot;Diesel motor has stopped&quot;&amp;nbsp;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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+                <mxCell id="315" value="&amp;nbsp; &amp;nbsp; &amp;nbsp; cout &amp;lt;&amp;lt; &quot;Diesel motor has started&quot;&amp;nbsp;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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+                        <mxPoint x="540.3199999999997" y="633.8399999999999" as="targetPoint"/>
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+                        <mxPoint x="1120.0000000000002" y="596" as="sourcePoint"/>
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                 <mxCell id="145" value="Classes" parent="0"/>
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@@ -103,8 +155,14 @@
                 <mxCell id="205" value="+ motor1() : Motor&lt;br&gt;+ motor2() : Motor&lt;br&gt;+ run() : void&lt;br&gt;+ halt() : void" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=#c5c7c9;fillColor=none;" parent="203" vertex="1">
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+                        <mxPoint x="459" y="77" as="targetPoint"/>
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                 <mxCell id="206" value="ElectrischeMotor" style="swimlane;fontStyle=0;align=center;verticalAlign=top;childLayout=stackLayout;horizontal=1;startSize=26;horizontalStack=0;resizeParent=1;resizeLast=0;collapsible=1;marginBottom=0;rounded=0;shadow=0;strokeWidth=1;fillColor=none;fontColor=#ffffff;strokeColor=#c5c7c9;" parent="145" vertex="1">
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@@ -115,22 +173,34 @@
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@@ -138,7 +208,7 @@
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@@ -154,7 +224,7 @@
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+                <mxCell id="215" value="" style="endArrow=block;endSize=10;endFill=0;shadow=0;strokeWidth=1;rounded=0;edgeStyle=elbowEdgeStyle;elbow=vertical;fillColor=#e51400;strokeColor=#FFFFFF;entryX=0.5;entryY=0;entryDx=0;entryDy=0;exitX=0.433;exitY=1.005;exitDx=0;exitDy=0;exitPerimeter=0;" parent="145" edge="1" source="208">
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@@ -273,7 +343,7 @@
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-                    <mxGeometry x="120" y="150" width="160" height="86" as="geometry">
+                    <mxGeometry x="27" y="150" width="160" height="86" as="geometry">
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@@ -284,7 +354,7 @@
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-                    <mxGeometry x="120" y="340" width="160" height="160" as="geometry">
+                    <mxGeometry x="27" y="340" width="160" height="160" as="geometry">
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@@ -308,8 +378,8 @@
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                     <mxGeometry relative="1" as="geometry">
-                        <mxPoint x="380.00000000000017" y="290" as="targetPoint"/>
-                        <mxPoint x="219" y="260" as="sourcePoint"/>
+                        <mxPoint x="290.00000000000017" y="290" as="targetPoint"/>
+                        <mxPoint x="129" y="260" as="sourcePoint"/>
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                 </mxCell>
                 <mxCell id="260" style="edgeStyle=none;html=1;exitX=0.25;exitY=0;exitDx=0;exitDy=0;endArrow=open;endFill=0;entryX=0.249;entryY=1.005;entryDx=0;entryDy=0;entryPerimeter=0;" parent="145" source="252" target="251" edge="1">
@@ -363,9 +433,9 @@
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+                <mxCell id="274" value="" style="edgeStyle=elbowEdgeStyle;elbow=horizontal;endArrow=classic;html=1;curved=0;rounded=0;endSize=8;startSize=8;entryX=0.25;entryY=0;entryDx=0;entryDy=0;exitX=1.01;exitY=0.507;exitDx=0;exitDy=0;exitPerimeter=0;" parent="145" target="226" edge="1" source="208">
                     <mxGeometry width="50" height="50" relative="1" as="geometry">
-                        <mxPoint x="990" y="609" as="sourcePoint"/>
+                        <mxPoint x="1090" y="610" as="sourcePoint"/>
                         <mxPoint x="1121" y="490" as="targetPoint"/>
                         <Array as="points">
                             <mxPoint x="1155" y="790"/>
@@ -397,11 +467,12 @@
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                     </mxGeometry>
                 </mxCell>
-                <mxCell id="279" value="" style="edgeStyle=elbowEdgeStyle;elbow=horizontal;endArrow=classic;html=1;curved=0;rounded=0;endSize=8;startSize=8;strokeWidth=1;exitX=1.007;exitY=0.551;exitDx=0;exitDy=0;exitPerimeter=0;entryX=0;entryY=0;entryDx=0;entryDy=0;" parent="145" source="205" target="226" edge="1">
+                <mxCell id="279" value="" style="edgeStyle=elbowEdgeStyle;elbow=horizontal;endArrow=classic;html=1;curved=0;rounded=0;endSize=8;startSize=8;strokeWidth=1;exitX=1.007;exitY=0.551;exitDx=0;exitDy=0;exitPerimeter=0;entryX=0.089;entryY=-0.001;entryDx=0;entryDy=0;entryPerimeter=0;" parent="145" source="205" target="226" edge="1">
                     <mxGeometry width="50" height="50" relative="1" as="geometry">
                         <mxPoint x="750" y="440" as="sourcePoint"/>
                         <mxPoint x="1120" y="1025" as="targetPoint"/>
                         <Array as="points">
+                            <mxPoint x="1130" y="540"/>
                             <mxPoint x="1100" y="730"/>
                             <mxPoint x="650" y="892"/>
                             <mxPoint x="850" y="1072"/>
@@ -418,7 +489,7 @@
                         </Array>
                     </mxGeometry>
                 </mxCell>
-                <mxCell id="283" value="" style="edgeStyle=elbowEdgeStyle;elbow=horizontal;endArrow=classic;html=1;curved=0;rounded=0;endSize=8;startSize=8;exitX=1.011;exitY=0.669;exitDx=0;exitDy=0;entryX=0;entryY=0.25;entryDx=0;entryDy=0;exitPerimeter=0;" edge="1" parent="145" source="266" target="264">
+                <mxCell id="283" value="" style="edgeStyle=elbowEdgeStyle;elbow=horizontal;endArrow=classic;html=1;curved=0;rounded=0;endSize=8;startSize=8;exitX=1.011;exitY=0.669;exitDx=0;exitDy=0;entryX=0;entryY=0.25;entryDx=0;entryDy=0;exitPerimeter=0;" parent="145" source="266" target="264" edge="1">
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                         <mxPoint x="829.9999999999998" y="235" as="sourcePoint"/>
                         <mxPoint x="931" y="470" as="targetPoint"/>
@@ -431,7 +502,7 @@
                         </Array>
                     </mxGeometry>
                 </mxCell>
-                <mxCell id="285" value="" style="edgeStyle=elbowEdgeStyle;elbow=horizontal;endArrow=classic;html=1;curved=0;rounded=0;endSize=8;startSize=8;exitX=1.013;exitY=1.133;exitDx=0;exitDy=0;entryX=0;entryY=0;entryDx=0;entryDy=0;exitPerimeter=0;" edge="1" parent="145" source="267" target="206">
+                <mxCell id="285" value="" style="edgeStyle=elbowEdgeStyle;elbow=horizontal;endArrow=classic;html=1;curved=0;rounded=0;endSize=8;startSize=8;exitX=1.013;exitY=1.133;exitDx=0;exitDy=0;entryX=0;entryY=0;entryDx=0;entryDy=0;exitPerimeter=0;" parent="145" source="267" target="206" edge="1">
                     <mxGeometry width="50" height="50" relative="1" as="geometry">
                         <mxPoint x="751.76" y="222.76" as="sourcePoint"/>
                         <mxPoint x="940" y="222" as="targetPoint"/>
@@ -444,7 +515,7 @@
                         </Array>
                     </mxGeometry>
                 </mxCell>
-                <mxCell id="287" value="" style="edgeStyle=elbowEdgeStyle;elbow=horizontal;endArrow=classic;html=1;curved=0;rounded=0;endSize=8;startSize=8;exitX=1.023;exitY=0.528;exitDx=0;exitDy=0;exitPerimeter=0;" edge="1" parent="145" source="267">
+                <mxCell id="287" value="" style="edgeStyle=elbowEdgeStyle;elbow=horizontal;endArrow=classic;html=1;curved=0;rounded=0;endSize=8;startSize=8;exitX=1.023;exitY=0.528;exitDx=0;exitDy=0;exitPerimeter=0;entryX=0.001;entryY=0.13;entryDx=0;entryDy=0;entryPerimeter=0;" parent="145" source="267" edge="1" target="209">
                     <mxGeometry width="50" height="50" relative="1" as="geometry">
                         <mxPoint x="752.0800000000002" y="269.99" as="sourcePoint"/>
                         <mxPoint x="1110" y="480" as="targetPoint"/>
@@ -457,6 +528,66 @@
                         </Array>
                     </mxGeometry>
                 </mxCell>
+                <mxCell id="322" value="" style="endArrow=none;dashed=1;html=1;dashPattern=1 3;strokeWidth=2;entryX=0.002;entryY=0.814;entryDx=0;entryDy=0;entryPerimeter=0;" edge="1" parent="145">
+                    <mxGeometry width="50" height="50" relative="1" as="geometry">
+                        <mxPoint x="360" y="420" as="sourcePoint"/>
+                        <mxPoint x="411.00000000000006" y="419.81000000000006" as="targetPoint"/>
+                    </mxGeometry>
+                </mxCell>
+                <mxCell id="323" value="return m1" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="145">
+                    <mxGeometry x="290" y="405" width="70" height="30" as="geometry"/>
+                </mxCell>
+                <mxCell id="324" value="" style="endArrow=none;dashed=1;html=1;dashPattern=1 3;strokeWidth=2;entryX=0.002;entryY=0.814;entryDx=0;entryDy=0;entryPerimeter=0;" edge="1" parent="145">
+                    <mxGeometry width="50" height="50" relative="1" as="geometry">
+                        <mxPoint x="360" y="435.19" as="sourcePoint"/>
+                        <mxPoint x="411" y="435.00000000000006" as="targetPoint"/>
+                    </mxGeometry>
+                </mxCell>
+                <mxCell id="325" value="return m2" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="145">
+                    <mxGeometry x="290" y="420" width="70" height="30" as="geometry"/>
+                </mxCell>
+                <mxCell id="326" value="" style="endArrow=none;dashed=1;html=1;dashPattern=1 3;strokeWidth=2;" edge="1" parent="145">
+                    <mxGeometry width="50" height="50" relative="1" as="geometry">
+                        <mxPoint x="1030" y="210" as="sourcePoint"/>
+                        <mxPoint x="1245" y="210" as="targetPoint"/>
+                    </mxGeometry>
+                </mxCell>
+                <mxCell id="327" value="&lt;div style=&quot;text-align: left;&quot;&gt;&lt;div style=&quot;font-family: Consolas, &amp;quot;Courier New&amp;quot;, monospace; font-size: 14px; line-height: 19px;&quot;&gt;&lt;font color=&quot;#ffffff&quot;&gt;cout &amp;lt;&amp;lt; dynamic_cast&amp;lt;TsensorImpl*&amp;gt;(getSubject())-&amp;gt;temperature() &amp;lt;&amp;lt; endl;&lt;/font&gt;&lt;/div&gt;&lt;/div&gt;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="145">
+                    <mxGeometry x="1240" y="195" width="580" height="30" as="geometry"/>
+                </mxCell>
+                <mxCell id="331" value="" style="endArrow=none;dashed=1;html=1;dashPattern=1 3;strokeWidth=2;" edge="1" parent="145">
+                    <mxGeometry width="50" height="50" relative="1" as="geometry">
+                        <mxPoint x="870" y="450" as="sourcePoint"/>
+                        <mxPoint x="870" y="40" as="targetPoint"/>
+                    </mxGeometry>
+                </mxCell>
+                <mxCell id="332" value="" style="endArrow=none;dashed=1;html=1;dashPattern=1 3;strokeWidth=2;" edge="1" parent="145">
+                    <mxGeometry width="50" height="50" relative="1" as="geometry">
+                        <mxPoint x="490" y="464" as="sourcePoint"/>
+                        <mxPoint x="880" y="460" as="targetPoint"/>
+                    </mxGeometry>
+                </mxCell>
+                <mxCell id="333" value="" style="endArrow=none;dashed=1;html=1;dashPattern=1 3;strokeWidth=2;" edge="1" parent="145">
+                    <mxGeometry width="50" height="50" relative="1" as="geometry">
+                        <mxPoint x="880" y="460" as="sourcePoint"/>
+                        <mxPoint x="880.0000000000002" y="48" as="targetPoint"/>
+                    </mxGeometry>
+                </mxCell>
+                <mxCell id="334" value="&lt;div style=&quot;font-family: Consolas, &amp;quot;Courier New&amp;quot;, monospace; font-size: 14px; line-height: 19px;&quot;&gt;&lt;div style=&quot;&quot;&gt;&amp;nbsp; &amp;nbsp; t1 = m1-&amp;gt;tsensor();&lt;/div&gt;&lt;div style=&quot;&quot;&gt;&amp;nbsp; &amp;nbsp; t1-&amp;gt;read();&lt;/div&gt;&lt;div style=&quot;&quot;&gt;&amp;nbsp; &amp;nbsp; m1-&amp;gt;start();&lt;/div&gt;&lt;div style=&quot;&quot;&gt;&amp;nbsp; &amp;nbsp; t2 = m2-&amp;gt;tsensor();&lt;/div&gt;&lt;div style=&quot;&quot;&gt;&amp;nbsp; &amp;nbsp; t2-&amp;gt;read();&lt;/div&gt;&lt;div style=&quot;&quot;&gt;&amp;nbsp; &amp;nbsp; m2-&amp;gt;start();&lt;/div&gt;&lt;/div&gt;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;fontColor=#FFFFFF;" vertex="1" parent="145">
+                    <mxGeometry x="670" y="-40" width="200" height="130" as="geometry"/>
+                </mxCell>
+                <mxCell id="335" value="&lt;div style=&quot;font-family: Consolas, &amp;quot;Courier New&amp;quot;, monospace; font-size: 14px; line-height: 19px;&quot;&gt;&lt;div style=&quot;&quot;&gt;&lt;div style=&quot;line-height: 19px;&quot;&gt;&lt;div style=&quot;&quot;&gt;&amp;nbsp; &amp;nbsp; m1-&amp;gt;stop();&lt;/div&gt;&lt;div style=&quot;&quot;&gt;&amp;nbsp; &amp;nbsp; m2-&amp;gt;stop();&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;fontColor=#FFFFFF;" vertex="1" parent="145">
+                    <mxGeometry x="850" y="10" width="140" height="50" as="geometry"/>
+                </mxCell>
+                <mxCell id="336" value="" style="endArrow=none;dashed=1;html=1;dashPattern=1 3;strokeWidth=2;entryX=0.002;entryY=0.814;entryDx=0;entryDy=0;entryPerimeter=0;" edge="1" parent="145">
+                    <mxGeometry width="50" height="50" relative="1" as="geometry">
+                        <mxPoint x="489" y="615.19" as="sourcePoint"/>
+                        <mxPoint x="540" y="615" as="targetPoint"/>
+                    </mxGeometry>
+                </mxCell>
+                <mxCell id="337" value="return t1" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="145">
+                    <mxGeometry x="419" y="600" width="70" height="30" as="geometry"/>
+                </mxCell>
             </root>
         </mxGraphModel>
     </diagram>
diff --git a/Opdracht_4/opdracht4.png b/Opdracht_4/opdracht4.png
new file mode 100644
index 0000000..13d9ba6
Binary files /dev/null and b/Opdracht_4/opdracht4.png differ