Several Mermaid diagrams

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49 merge newbranch 49 merge newbranch
50 commit 50 commit
51 branch b2 51 branch b2
52 committttttttttttt++++++++++++++++++++++++++++++++++++++++ 52 committttttttttttthhhhhhhhhhhhhhhhhhhhhhhhhhhh
53 ``` 53 ```