diff --git a/playground/tencent/pairing-with-dan-and-alex/main.bpmn b/playground/tencent/pairing-with-dan-and-alex/main.bpmn
index 56d45139..0e515539 100644
--- a/playground/tencent/pairing-with-dan-and-alex/main.bpmn
+++ b/playground/tencent/pairing-with-dan-and-alex/main.bpmn
@@ -20,13 +20,61 @@
         <bpmn:flowNodeRef>Activity_0c72gmg</bpmn:flowNodeRef>
       </bpmn:lane>
       <bpmn:lane id="Lane_1l8m0lz" name="approvers_two">
+        <bpmn:flowNodeRef>Gateway_1jml3b2</bpmn:flowNodeRef>
+        <bpmn:flowNodeRef>Gateway_0nhehc8</bpmn:flowNodeRef>
         <bpmn:flowNodeRef>Activity_1uwpon2</bpmn:flowNodeRef>
       </bpmn:lane>
     </bpmn:laneSet>
     <bpmn:scriptTask id="Activity_0u39yj2" name="set lane owners">
+      <bpmn:extensionElements>
+        <spiffworkflow:unitTests>
+          <spiffworkflow:unitTest id="sanity_check">
+            <spiffworkflow:inputJson>{
+  "approvers": [
+    "dan@sartography.com"
+  ]
+}</spiffworkflow:inputJson>
+            <spiffworkflow:expectedOutputJson>{
+  "approvers": [
+    "dan@sartography.com"
+  ],
+  "lane_owners": {
+    "approvers_one": [
+      "dan@sartography.com"
+    ]
+  }
+}</spiffworkflow:expectedOutputJson>
+          </spiffworkflow:unitTest>
+          <spiffworkflow:unitTest id="sanity_check_two">
+            <spiffworkflow:inputJson>{
+  "approvers": [
+    "dan@sartography.com",
+    "dingli@gmail.com"
+  ]
+}</spiffworkflow:inputJson>
+            <spiffworkflow:expectedOutputJson>{
+  "approvers": [
+    "dan@sartography.com",
+    "dingli@gmail.com"
+  ],
+  "lane_owners": {
+    "approvers_one": [
+      "dan@sartography.com"
+    ],
+    "approvers_two": [
+      "dingli@gmail.com"
+    ]
+  }
+}</spiffworkflow:expectedOutputJson>
+          </spiffworkflow:unitTest>
+        </spiffworkflow:unitTests>
+      </bpmn:extensionElements>
       <bpmn:incoming>Flow_0gi8bwf</bpmn:incoming>
       <bpmn:outgoing>Flow_0qdzj5v</bpmn:outgoing>
-      <bpmn:script>lane_owners = {"approvers_one": approvers}</bpmn:script>
+      <bpmn:script>lane_owners = {"approvers_one": [approvers[0]]}
+
+if len(approvers) &gt; 1:
+    lane_owners["approvers_two"] = [approvers[1]]</bpmn:script>
     </bpmn:scriptTask>
     <bpmn:startEvent id="StartEvent_1">
       <bpmn:outgoing>Flow_130ey79</bpmn:outgoing>
@@ -54,21 +102,21 @@
     <bpmn:sequenceFlow id="Flow_130ey79" sourceRef="StartEvent_1" targetRef="Activity_19x8z4q" />
     <bpmn:sequenceFlow id="Flow_1gfzcde" sourceRef="Activity_19x8z4q" targetRef="Activity_0wl95bx" />
     <bpmn:sequenceFlow id="Flow_0pjve0h" sourceRef="Gateway_0jycv6k" targetRef="Activity_1kdx24p" />
-    <bpmn:sequenceFlow id="Flow_0ejuqyx" sourceRef="Gateway_0jycv6k" targetRef="Activity_1uwpon2" />
+    <bpmn:sequenceFlow id="Flow_0ejuqyx" sourceRef="Gateway_0jycv6k" targetRef="Gateway_1jml3b2" />
     <bpmn:parallelGateway id="Gateway_0jycv6k">
       <bpmn:incoming>Flow_0qdzj5v</bpmn:incoming>
       <bpmn:outgoing>Flow_0pjve0h</bpmn:outgoing>
       <bpmn:outgoing>Flow_0ejuqyx</bpmn:outgoing>
     </bpmn:parallelGateway>
-    <bpmn:sequenceFlow id="Flow_1brfsjf" sourceRef="Activity_1uwpon2" targetRef="Gateway_0fp8qlg" />
+    <bpmn:sequenceFlow id="Flow_1brfsjf" sourceRef="Activity_1uwpon2" targetRef="Gateway_0nhehc8" />
     <bpmn:parallelGateway id="Gateway_0fp8qlg">
       <bpmn:incoming>Flow_12aqem8</bpmn:incoming>
-      <bpmn:incoming>Flow_1brfsjf</bpmn:incoming>
+      <bpmn:incoming>Flow_1k5uue7</bpmn:incoming>
       <bpmn:outgoing>Flow_1l5hvh4</bpmn:outgoing>
     </bpmn:parallelGateway>
     <bpmn:sequenceFlow id="Flow_1cfkj9x" sourceRef="Gateway_1vfdi2v" targetRef="Event_1dt5ijd" />
     <bpmn:sequenceFlow id="Flow_0e6s3lk" sourceRef="Gateway_1vfdi2v" targetRef="Event_1mrcpko">
-      <bpmn:conditionExpression>do_you_approve == "rejected"</bpmn:conditionExpression>
+      <bpmn:conditionExpression>approved</bpmn:conditionExpression>
     </bpmn:sequenceFlow>
     <bpmn:sequenceFlow id="Flow_1l5hvh4" sourceRef="Gateway_0fp8qlg" targetRef="Activity_0c72gmg" />
     <bpmn:exclusiveGateway id="Gateway_1vfdi2v" name="approved?" default="Flow_1cfkj9x">
@@ -86,7 +134,7 @@
     <bpmn:scriptTask id="Activity_0c72gmg" name="All Approved?">
       <bpmn:incoming>Flow_1l5hvh4</bpmn:incoming>
       <bpmn:outgoing>Flow_1etxa8x</bpmn:outgoing>
-      <bpmn:script>approval</bpmn:script>
+      <bpmn:script>approved = approval_one and approval_two </bpmn:script>
     </bpmn:scriptTask>
     <bpmn:userTask id="Activity_1kdx24p" name="Approve Request">
       <bpmn:extensionElements>
@@ -106,15 +154,30 @@ By clicking the button below you approve this request.
       <bpmn:incoming>Flow_0pjve0h</bpmn:incoming>
       <bpmn:outgoing>Flow_12aqem8</bpmn:outgoing>
     </bpmn:userTask>
-    <bpmn:userTask id="Activity_1uwpon2" name="Approve Request">
+    <bpmn:exclusiveGateway id="Gateway_1jml3b2" name="has second approver?" default="Flow_03muudp">
       <bpmn:incoming>Flow_0ejuqyx</bpmn:incoming>
+      <bpmn:outgoing>Flow_03muudp</bpmn:outgoing>
+      <bpmn:outgoing>Flow_1j9t6zx</bpmn:outgoing>
+    </bpmn:exclusiveGateway>
+    <bpmn:sequenceFlow id="Flow_03muudp" sourceRef="Gateway_1jml3b2" targetRef="Activity_1uwpon2" />
+    <bpmn:exclusiveGateway id="Gateway_0nhehc8">
+      <bpmn:incoming>Flow_1brfsjf</bpmn:incoming>
+      <bpmn:incoming>Flow_1j9t6zx</bpmn:incoming>
+      <bpmn:outgoing>Flow_1k5uue7</bpmn:outgoing>
+    </bpmn:exclusiveGateway>
+    <bpmn:sequenceFlow id="Flow_1k5uue7" sourceRef="Gateway_0nhehc8" targetRef="Gateway_0fp8qlg" />
+    <bpmn:userTask id="Activity_1uwpon2" name="Approve Request">
+      <bpmn:incoming>Flow_03muudp</bpmn:incoming>
       <bpmn:outgoing>Flow_1brfsjf</bpmn:outgoing>
     </bpmn:userTask>
+    <bpmn:sequenceFlow id="Flow_1j9t6zx" sourceRef="Gateway_1jml3b2" targetRef="Gateway_0nhehc8">
+      <bpmn:conditionExpression>len(approvers) == 1</bpmn:conditionExpression>
+    </bpmn:sequenceFlow>
   </bpmn:process>
   <bpmndi:BPMNDiagram id="BPMNDiagram_1">
     <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Collaboration_1gv878q">
       <bpmndi:BPMNShape id="Participant_0m2fswd_di" bpmnElement="Participant_0m2fswd" isHorizontal="true">
-        <dc:Bounds x="-420" y="-80" width="1270" height="530" />
+        <dc:Bounds x="-420" y="-80" width="1270" height="570" />
       </bpmndi:BPMNShape>
       <bpmndi:BPMNShape id="Lane_1hrnzcs_di" bpmnElement="Lane_1hrnzcs" isHorizontal="true">
         <dc:Bounds x="-390" y="110" width="1240" height="200" />
@@ -124,7 +187,7 @@ By clicking the button below you approve this request.
         <dc:Bounds x="-390" y="-80" width="1240" height="190" />
       </bpmndi:BPMNShape>
       <bpmndi:BPMNShape id="Lane_1l8m0lz_di" bpmnElement="Lane_1l8m0lz" isHorizontal="true">
-        <dc:Bounds x="-390" y="310" width="1240" height="140" />
+        <dc:Bounds x="-390" y="310" width="1240" height="180" />
         <bpmndi:BPMNLabel />
       </bpmndi:BPMNShape>
       <bpmndi:BPMNShape id="Activity_0dbxi08_di" bpmnElement="Activity_0u39yj2">
@@ -171,10 +234,19 @@ By clicking the button below you approve this request.
         <bpmndi:BPMNLabel />
       </bpmndi:BPMNShape>
       <bpmndi:BPMNShape id="Activity_0o2c103_di" bpmnElement="Activity_1kdx24p">
-        <dc:Bounds x="90" y="170" width="100" height="80" />
+        <dc:Bounds x="110" y="170" width="100" height="80" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="Gateway_1jml3b2_di" bpmnElement="Gateway_1jml3b2" isMarkerVisible="true">
+        <dc:Bounds x="15" y="355" width="50" height="50" />
+        <bpmndi:BPMNLabel>
+          <dc:Bounds x="12" y="325" width="57" height="27" />
+        </bpmndi:BPMNLabel>
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="Gateway_0nhehc8_di" bpmnElement="Gateway_0nhehc8" isMarkerVisible="true">
+        <dc:Bounds x="235" y="355" width="50" height="50" />
       </bpmndi:BPMNShape>
       <bpmndi:BPMNShape id="Activity_0p6bw0p_di" bpmnElement="Activity_1uwpon2">
-        <dc:Bounds x="90" y="340" width="100" height="80" />
+        <dc:Bounds x="100" y="340" width="100" height="80" />
       </bpmndi:BPMNShape>
       <bpmndi:BPMNEdge id="Flow_0gi8bwf_di" bpmnElement="Flow_0gi8bwf">
         <di:waypoint x="-90" y="30" />
@@ -185,7 +257,7 @@ By clicking the button below you approve this request.
         <di:waypoint x="-20" y="85" />
       </bpmndi:BPMNEdge>
       <bpmndi:BPMNEdge id="Flow_12aqem8_di" bpmnElement="Flow_12aqem8">
-        <di:waypoint x="190" y="210" />
+        <di:waypoint x="210" y="210" />
         <di:waypoint x="310" y="210" />
         <di:waypoint x="310" y="135" />
       </bpmndi:BPMNEdge>
@@ -200,17 +272,16 @@ By clicking the button below you approve this request.
       <bpmndi:BPMNEdge id="Flow_0pjve0h_di" bpmnElement="Flow_0pjve0h">
         <di:waypoint x="-20" y="135" />
         <di:waypoint x="-20" y="210" />
-        <di:waypoint x="90" y="210" />
+        <di:waypoint x="110" y="210" />
       </bpmndi:BPMNEdge>
       <bpmndi:BPMNEdge id="Flow_0ejuqyx_di" bpmnElement="Flow_0ejuqyx">
         <di:waypoint x="-20" y="135" />
         <di:waypoint x="-20" y="380" />
-        <di:waypoint x="90" y="380" />
+        <di:waypoint x="15" y="380" />
       </bpmndi:BPMNEdge>
       <bpmndi:BPMNEdge id="Flow_1brfsjf_di" bpmnElement="Flow_1brfsjf">
-        <di:waypoint x="190" y="380" />
-        <di:waypoint x="310" y="380" />
-        <di:waypoint x="310" y="135" />
+        <di:waypoint x="200" y="380" />
+        <di:waypoint x="235" y="380" />
       </bpmndi:BPMNEdge>
       <bpmndi:BPMNEdge id="Flow_1cfkj9x_di" bpmnElement="Flow_1cfkj9x">
         <di:waypoint x="545" y="0" />
@@ -230,6 +301,21 @@ By clicking the button below you approve this request.
         <di:waypoint x="460" y="0" />
         <di:waypoint x="495" y="0" />
       </bpmndi:BPMNEdge>
+      <bpmndi:BPMNEdge id="Flow_03muudp_di" bpmnElement="Flow_03muudp">
+        <di:waypoint x="65" y="380" />
+        <di:waypoint x="100" y="380" />
+      </bpmndi:BPMNEdge>
+      <bpmndi:BPMNEdge id="Flow_1k5uue7_di" bpmnElement="Flow_1k5uue7">
+        <di:waypoint x="285" y="380" />
+        <di:waypoint x="310" y="380" />
+        <di:waypoint x="310" y="135" />
+      </bpmndi:BPMNEdge>
+      <bpmndi:BPMNEdge id="Flow_1j9t6zx_di" bpmnElement="Flow_1j9t6zx">
+        <di:waypoint x="40" y="405" />
+        <di:waypoint x="40" y="460" />
+        <di:waypoint x="260" y="460" />
+        <di:waypoint x="260" y="405" />
+      </bpmndi:BPMNEdge>
     </bpmndi:BPMNPlane>
   </bpmndi:BPMNDiagram>
 </bpmn:definitions>