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var polylines = L.geoJson(polylines, {
      onEachFeature: function (feature, layer) {
        L.polylineDecorator(layer, {
            patterns: [
                {offset: 25, repeat: 30, symbol: L.Symbol.arrowHead({pixelSize: 15, pathOptions: {fillOpacity: 1, weight: 0}})}
            ]
        })
    }
}).addTo(map);