@startuml
title Sequence diagram example: Indirect ping test

!include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Container.puml


Person(John Doe, "John Doe")
System(another-server, "another-server")
System(a-server, "a-server")    
Rel_D(John Doe, another-server, " ") 
Rel_D(another-server, a-server, " ")     
@enduml