How to use 'cdn chartjs' in JavaScript

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function buildChart(){
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  console.log(dataArray1);
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  console.log(dataArray2);
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var chart = c3.generate({
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    bindto: '#chart',
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    data: {
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      columns: [
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        dataArray1,
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        dataArray2
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      ],
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      axes: {
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        Injuries: 'y2'
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      },
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      types: {
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        Injuries: 'bar',
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      }
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    },
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    axis: {
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      y: {
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        label: {
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          text: 'Y Label',
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          position: 'outer-middle'
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        },
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        tick: {
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          format: d3.format("$,") // ADD
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        }
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      },
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      y2: {
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        show: true,
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        label: {
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          text: 'Y2 Label',
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          position: 'outer-middle'
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        }
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      }
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    }
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});
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}