core/src/main/java/org/apache/sling/cms/core/internal/operations/CheckpointOperation.java [75:83]:
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			final Map<String, String> modificationSourcesContainingPostfix = new HashMap<>();
			final Set<String> allModificationSources = new HashSet<>(changes.size());
			for (final Modification modification : changes) {
				final String source = modification.getSource();
				if (source != null) {
					allModificationSources.add(source);
					final int atIndex = source.indexOf('@');
					if (atIndex > 0) {
						modificationSourcesContainingPostfix.put(source.substring(0, atIndex), source);
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core/src/main/java/org/apache/sling/cms/core/usergenerated/impl/ApproveUGCOperation.java [96:104]:
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            final Map<String, String> modificationSourcesContainingPostfix = new HashMap<>();
            final Set<String> allModificationSources = new HashSet<>(changes.size());
            for (final Modification modification : changes) {
                final String source = modification.getSource();
                if (source != null) {
                    allModificationSources.add(source);
                    final int atIndex = source.indexOf('@');
                    if (atIndex > 0) {
                        modificationSourcesContainingPostfix.put(source.substring(0, atIndex), source);
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