{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "width": 600,
  "height": 400,
  "data": {
    "values": [
      {"operation": "Operation A", "version": "Before", "performance": 85, "order": 0},
      {"operation": "Operation A", "version": "After", "performance": 92, "order": 1},

      {"operation": "Operation B", "version": "Before", "performance": 70, "order": 0},
      {"operation": "Operation B", "version": "After", "performance": 88, "order": 1},
      
      {"operation": "Operation C", "version": "Before", "performance": 60, "order": 0},
      {"operation": "Operation C", "version": "After", "performance": 79, "order": 1}
    ]
  },
  "mark": {
    "type": "bar"
  },
  "encoding": {
    "x": {
      "field": "operation",
      "type": "nominal",
      "axis": {"title": "Operations"}
    },
    "y": {
      "field": "performance",
      "type": "quantitative",
      "axis": {"title": "Performance Score"}
    },
    "color": {
      "field": "version",
      "scale": {
        "domain": ["Before", "After"],
        "range": ["rgb(159, 157, 150)", "rgb(135, 40, 94)"]
      },
      "legend": {"title": "Update Version"}
    },
    "strokeDash": {
      "field": "version",
      "scale": {
        "domain": ["Before", "After"],
        "range": [[5, 5], []]
      }
    },
    "xOffset": {
      "field": "order"
    }
  }
}