Experimental, do not use.
A {@link DuplicationGroup} is a list of duplicated {@link Block}s. One block is considered as the original code and all others are duplicates. Use {@link SensorContext#duplicationBuilder(org.sonar.api.batch.fs.InputFile)} and{@link SensorContext#saveDuplications(org.sonar.api.batch.fs.InputFile,List)}.
@since 4.5