add partials mermaid

[1].

flowchart TD A([Mulai]) B[/a, b, c/] C[D = bxb - 4ac] D{D >= 0} E[x1] F[x2] G[/x1, x2/] H([Selesai]) A --> B --> C --> D D -- Ya --> E --> F --> G --> H D -- Tidak --> H style A fill:#f9f,stroke:#333,stroke-width:4px classDef decision stroke:#f88 class D decision

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