XY: Multiple Bar Series

Two bar series comparing years, drawn overlapping as mermaid does.

xy-multiple-bar-series.mmd
xychart-beta
    title "2023 vs 2024 Sales"
    x-axis [Q1, Q2, Q3, Q4]
    bar [200, 250, 300, 280]
    bar [230, 280, 320, 350]
Output
XY chart, Zombie Mermaid Q1 Q2 Q3 Q4 200 220 240 260 280 300 320 340 2023 vs 2024 Sales Bar 1 Bar 2

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