please check in the g4 of the mermaid which can help developers to show flowgraph as so on

[stride83]

the mermaid is so useful for it developers , at the same time , people can use mermaid to driven the program running as the mermaid show . so need the mermaid grammar g4 file .
thanks

[stride83]

first step: to develop 【flowgraph】 grammar

second step: to develop 【stateDiagram-v2】 grammar

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