title : SEQUENCE DIAGRAM BLOCK
https://d408920197471748-dot-p100024006-dot-nitokucom.appspot.com/frame/@nitoku.public/title?tk=pu&us=pu
loop every day Alice->>John: Hello John, how are you? John-->>Alice: Great! end
https://d725929977264673-dot-p100024006-dot-nitokucom.appspot.com/frame/@nitoku.public/sequence?tk=pu&us=pu
Sequence Diagram Syntax
https://d940606934929292-dot-p100024006-dot-nitokucom.appspot.com/frame/@nitoku.design/license?tk=pu&us=pu