title : SEQUENCE DIAGRAM BLOCK
https://p101001004-dot-nitokucom.uc.r.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://p101001004-dot-nitokucom.uc.r.appspot.com/frame/@nitoku.public/sequence?tk=pu&us=pu
Sequence Diagram Syntax
https://p101001004-dot-nitokucom.uc.r.appspot.com/frame/@nitoku.design/license?tk=pu&us=pu