src/main/java/com/amazonaws/services/neptune/propertygraph/io/RewriteAndMergeCsv.java [130:142]:
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                    String[] additionalElementHeaders = label.hasFromAndToLabels() ?
                            new String[]{"~fromLabels", "~toLabels"} :
                            new String[]{};

                    String[] filePropertyHeaders =
                            labelSchema.propertySchemas().stream()
                                    .map(p -> p.property().toString())
                                    .collect(Collectors.toList())
                                    .toArray(new String[]{});

                    String[] fileHeaders = ArrayUtils.addAll(
                            graphElementType.tokenNames().toArray(new String[]{}),
                            ArrayUtils.addAll(additionalElementHeaders, filePropertyHeaders));
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src/main/java/com/amazonaws/services/neptune/propertygraph/io/RewriteCsv.java [123:135]:
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            String[] additionalElementHeaders = label.hasFromAndToLabels() ?
                    new String[]{"~fromLabels", "~toLabels"} :
                    new String[]{};

            String[] filePropertyHeaders =
                    labelSchema.propertySchemas().stream()
                            .map(p -> p.property().toString())
                            .collect(Collectors.toList())
                            .toArray(new String[]{});

            String[] fileHeaders = ArrayUtils.addAll(
                    graphElementType.tokenNames().toArray(new String[]{}),
                    ArrayUtils.addAll(additionalElementHeaders, filePropertyHeaders));
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