Refer to the exhibit.

Sequence can be described as follows.

* When web client sends the request , it sends payload as Blue (mentioned inquestion)

* In first iteration this will go to default choice , which sets payload to Red

* Via default route , flow will call itself with payload as Red

* In second iteration , as payload is Red , it will go to first route in choice router which will setpayload to Blk and second iteration will end returning back payload as Blk to first iteration.

* This Blk will be again set to payload and first iteration will end returning back response as Blk