c3r-cli-spark/src/main/java/com/amazonaws/c3r/spark/io/schema/InteractiveSchemaGenerator.java [471:482]:
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    ColumnHeader promptTargetHeader(final ColumnHeader sourceHeader,
                                    @NonNull final ColumnType type) {
        final ColumnHeader targetHeader = promptTargetHeaderAndSuffix(sourceHeader, type);
        if (usedColumnHeaders.contains(targetHeader)) {
            consoleOutput.println("Expected a unique target header, but `" + targetHeader + "` has already been used in this schema.");
            return null;
        } else {
            usedColumnHeaders.add(targetHeader);
        }

        return targetHeader;
    }
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c3r-cli/src/main/java/com/amazonaws/c3r/io/schema/InteractiveSchemaGenerator.java [471:482]:
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    ColumnHeader promptTargetHeader(final ColumnHeader sourceHeader,
                                    @NonNull final ColumnType type) {
        final ColumnHeader targetHeader = promptTargetHeaderAndSuffix(sourceHeader, type);
        if (usedColumnHeaders.contains(targetHeader)) {
            consoleOutput.println("Expected a unique target header, but `" + targetHeader + "` has already been used in this schema.");
            return null;
        } else {
            usedColumnHeaders.add(targetHeader);
        }

        return targetHeader;
    }
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