diff --git a/Opdracht_4/opdracht4.drawio b/Opdracht_4/opdracht4.drawio
index a6bbc7c..d2a301f 100644
--- a/Opdracht_4/opdracht4.drawio
+++ b/Opdracht_4/opdracht4.drawio
@@ -1,13 +1,13 @@
 <mxfile host="65bd71144e">
     <diagram id="KfANXQmF8nHkjfM11mp0" name="Page-1">
-        <mxGraphModel dx="1614" dy="1006" 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">
+        <mxGraphModel dx="2007" dy="1006" 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">
             <root>
                 <mxCell id="0"/>
                 <mxCell id="1" style="" parent="0"/>
                 <mxCell id="65" value="" style="rounded=0;whiteSpace=wrap;html=1;labelBackgroundColor=#d1d1d2;strokeColor=#006EAF;fontSize=16;fillColor=#1ba1e2;fontColor=#ffffff;" parent="1" vertex="1">
                     <mxGeometry x="350" y="750" width="950" height="430" as="geometry"/>
                 </mxCell>
-                <mxCell id="2" value="" style="rounded=0;whiteSpace=wrap;html=1;fillColor=#D882C7;strokeColor=#FF66B3;fontColor=#ffffff;" parent="1" vertex="1">
+                <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"/>
                 </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">
@@ -45,15 +45,41 @@
                 <mxCell id="124" value="" style="rounded=0;whiteSpace=wrap;html=1;fillColor=none;" parent="1" vertex="1">
                     <mxGeometry x="890" y="135" width="230" height="140" as="geometry"/>
                 </mxCell>
-                <mxCell id="280" value="" style="rounded=0;whiteSpace=wrap;html=1;fillColor=none;" vertex="1" parent="1">
+                <mxCell id="280" value="" style="rounded=0;whiteSpace=wrap;html=1;fillColor=none;" parent="1" vertex="1">
                     <mxGeometry x="370" y="780" width="920" height="330" as="geometry"/>
                 </mxCell>
-                <mxCell id="281" value="M" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
+                <mxCell id="281" value="M" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
                     <mxGeometry x="860" y="1050" width="30" height="30" as="geometry"/>
                 </mxCell>
-                <mxCell id="282" value="2" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
+                <mxCell id="282" value="2" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
                     <mxGeometry x="820" y="1050" width="30" height="30" as="geometry"/>
                 </mxCell>
+                <mxCell id="284" value="" style="edgeStyle=elbowEdgeStyle;elbow=horizontal;endArrow=classic;html=1;curved=0;rounded=0;endSize=8;startSize=8;entryX=1.02;entryY=0.105;entryDx=0;entryDy=0;entryPerimeter=0;" edge="1" parent="1" target="205">
+                    <mxGeometry width="50" height="50" relative="1" as="geometry">
+                        <mxPoint x="650" y="260" as="sourcePoint"/>
+                        <mxPoint x="751" y="495" as="targetPoint"/>
+                        <Array as="points">
+                            <mxPoint x="650" y="320"/>
+                            <mxPoint x="571" y="395"/>
+                            <mxPoint x="751" y="445"/>
+                            <mxPoint x="740" y="445"/>
+                            <mxPoint x="751" y="465"/>
+                        </Array>
+                    </mxGeometry>
+                </mxCell>
+                <mxCell id="286" value="" style="edgeStyle=elbowEdgeStyle;elbow=horizontal;endArrow=classic;html=1;curved=0;rounded=0;endSize=8;startSize=8;entryX=0.75;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" target="200">
+                    <mxGeometry width="50" height="50" relative="1" as="geometry">
+                        <mxPoint x="680" y="260" as="sourcePoint"/>
+                        <mxPoint x="584.2" y="426.35000000000014" as="targetPoint"/>
+                        <Array as="points">
+                            <mxPoint x="681" y="410"/>
+                            <mxPoint x="581" y="405"/>
+                            <mxPoint x="761" y="455"/>
+                            <mxPoint x="750" y="455"/>
+                            <mxPoint x="761" y="475"/>
+                        </Array>
+                    </mxGeometry>
+                </mxCell>
                 <mxCell id="145" value="Classes" parent="0"/>
                 <mxCell id="200" value="DieselMotor" 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">
                     <mxGeometry x="561" y="539" width="160" height="126" as="geometry">
@@ -229,15 +255,6 @@
                         </Array>
                     </mxGeometry>
                 </mxCell>
-                <mxCell id="240" style="edgeStyle=orthogonalEdgeStyle;rounded=0;html=1;dashed=1;labelBackgroundColor=none;startFill=0;endArrow=open;endFill=0;endSize=10;fontFamily=Verdana;fontSize=10;entryX=0;entryY=0;entryDx=0;entryDy=0;" parent="145" target="223" edge="1">
-                    <mxGeometry relative="1" as="geometry">
-                        <Array as="points">
-                            <mxPoint x="780" y="950"/>
-                        </Array>
-                        <mxPoint x="540" y="949.5" as="sourcePoint"/>
-                        <mxPoint x="650" y="949.4999999999999" as="targetPoint"/>
-                    </mxGeometry>
-                </mxCell>
                 <mxCell id="243" value="" style="endArrow=none;html=1;fontSize=12;exitX=0.184;exitY=1.005;exitDx=0;exitDy=0;exitPerimeter=0;entryX=0.461;entryY=1.003;entryDx=0;entryDy=0;entryPerimeter=0;" parent="145" target="225" edge="1">
                     <mxGeometry width="50" height="50" relative="1" as="geometry">
                         <mxPoint x="400.44000000000005" y="1029.35" as="sourcePoint"/>
@@ -312,7 +329,7 @@
                     </mxGeometry>
                 </mxCell>
                 <mxCell id="262" value="UI" 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">
-                    <mxGeometry x="930" y="155" width="160" height="100" as="geometry">
+                    <mxGeometry x="930" y="157" width="160" height="100" as="geometry">
                         <mxRectangle x="340" y="380" width="170" height="26" as="alternateBounds"/>
                     </mxGeometry>
                 </mxCell>
@@ -380,7 +397,7 @@
                         </Array>
                     </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;" edge="1" parent="145" source="205" target="226">
+                <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">
                     <mxGeometry width="50" height="50" relative="1" as="geometry">
                         <mxPoint x="750" y="440" as="sourcePoint"/>
                         <mxPoint x="1120" y="1025" as="targetPoint"/>
@@ -401,6 +418,45 @@
                         </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">
+                    <mxGeometry width="50" height="50" relative="1" as="geometry">
+                        <mxPoint x="829.9999999999998" y="235" as="sourcePoint"/>
+                        <mxPoint x="931" y="470" as="targetPoint"/>
+                        <Array as="points">
+                            <mxPoint x="840" y="220"/>
+                            <mxPoint x="751" y="370"/>
+                            <mxPoint x="931" y="420"/>
+                            <mxPoint x="920" y="420"/>
+                            <mxPoint x="931" y="440"/>
+                        </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">
+                    <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"/>
+                        <Array as="points">
+                            <mxPoint x="831" y="410"/>
+                            <mxPoint x="761" y="380"/>
+                            <mxPoint x="941" y="430"/>
+                            <mxPoint x="930" y="430"/>
+                            <mxPoint x="941" y="450"/>
+                        </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">
+                    <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"/>
+                        <Array as="points">
+                            <mxPoint x="841" y="420"/>
+                            <mxPoint x="771" y="390"/>
+                            <mxPoint x="951" y="440"/>
+                            <mxPoint x="940" y="440"/>
+                            <mxPoint x="951" y="460"/>
+                        </Array>
+                    </mxGeometry>
+                </mxCell>
             </root>
         </mxGraphModel>
     </diagram>