@startuml box B1 participant Alice order 10 participant Bob order 20 ' add it here <---------------- participant Bob1 order 19 end box box B2 participant Coco order 30 participant David order 40 end box Alice -> Bob: hello Bob -> Coco: hello Coco -> David : hello return hi Coco -->Bob:hi ' you can create it here <---------------- create Bob1 Bob->Bob1:new @enduml Submit amiga aws-orange black-knight bluegray blueprint cerulean-outline cerulean crt-amber crt-green cyborg-outline cyborg hacker lightgray mars materia-outline materia metal mimeograph minty plain reddress-darkblue reddress-darkgreen reddress-darkorange reddress-darkred reddress-lightblue reddress-lightgreen reddress-lightorange reddress-lightred sandstone silver sketchy-outline sketchy spacelab spacelab-white superhero-outline superhero toy united vibrant       🎉 Discover the future PlantUML Web Editor! 🚀  PNG  SVG  ASCII Art