Test diagrams

Diagram

{{#mermaid:sequenceDiagram participant Alice participant Bob

 Alice->John: Hello John, how are you?
 loop Healthcheck
      John->John: Fight against hypochondria
 end
 Note right of John: Rational thoughts 
prevail...
   John-->Alice: Great!
   John->Bob: How about you?
   Bob-->John: Jolly good!

}}