diff --git a/Pdf4QtDocPageOrganizer/Pdf4QtDocPageOrganizer.pro b/Pdf4QtDocPageOrganizer/Pdf4QtDocPageOrganizer.pro
index 69d1e45..b8faee2 100644
--- a/Pdf4QtDocPageOrganizer/Pdf4QtDocPageOrganizer.pro
+++ b/Pdf4QtDocPageOrganizer/Pdf4QtDocPageOrganizer.pro
@@ -24,7 +24,7 @@ VERSION = 1.0.0
 
 RC_ICONS = $$PWD/app-icon.ico
 
-QMAKE_TARGET_DESCRIPTION = "PDF document page organizer"
+QMAKE_TARGET_DESCRIPTION = "PDF Document Page Organizer"
 QMAKE_TARGET_COPYRIGHT = "(c) Jakub Melka 2018-2021"
 
 DEFINES += QT_DEPRECATED_WARNINGS
diff --git a/Pdf4QtDocPageOrganizer/mainwindow.cpp b/Pdf4QtDocPageOrganizer/mainwindow.cpp
index 0456c2d..4e3fd2b 100644
--- a/Pdf4QtDocPageOrganizer/mainwindow.cpp
+++ b/Pdf4QtDocPageOrganizer/mainwindow.cpp
@@ -83,6 +83,12 @@ MainWindow::MainWindow(QWidget* parent) :
     ui->actionInsert_PDF->setData(int(Operation::InsertPDF));
     ui->actionGet_Source->setData(int(Operation::GetSource));
     ui->actionAbout->setData(int(Operation::About));
+    ui->actionInvert_Selection->setData(int(Operation::InvertSelection));
+    ui->actionRegroup_Even_Odd->setData(int(Operation::RegroupEvenOdd));
+    ui->actionRegroup_by_Page_Pairs->setData(int(Operation::RegroupPaired));
+    ui->actionRegroup_by_Bookmarks->setData(int(Operation::RegroupBookmarks));
+    ui->actionRegroup_by_Alternating_Pages->setData(int(Operation::RegroupAlternatingPages));
+    ui->actionRegroup_by_Alternating_Pages_Reversed_Order->setData(int(Operation::RegroupAlternatingPagesReversed));
 
     QToolBar* mainToolbar = addToolBar(tr("Main"));
     mainToolbar->setObjectName("main_toolbar");
@@ -98,7 +104,10 @@ MainWindow::MainWindow(QWidget* parent) :
     insertToolbar->addActions({ ui->actionInsert_PDF, ui->actionInsert_Image, ui->actionInsert_Empty_Page });
     QToolBar* selectToolbar = addToolBar(tr("Select"));
     selectToolbar->setObjectName("select_toolbar");
-    selectToolbar->addActions({ ui->actionSelect_None, ui->actionSelect_All, ui->actionSelect_Even, ui->actionSelect_Odd, ui->actionSelect_Portrait, ui->actionSelect_Landscape });
+    selectToolbar->addActions({ ui->actionSelect_None, ui->actionSelect_All, ui->actionSelect_Even, ui->actionSelect_Odd, ui->actionSelect_Portrait, ui->actionSelect_Landscape, ui->actionInvert_Selection });
+    QToolBar* regroupToolbar = addToolBar(tr("Regroup"));
+    regroupToolbar->setObjectName("regroup_toolbar");
+    regroupToolbar->addActions({ ui->actionRegroup_Even_Odd, ui->actionRegroup_by_Page_Pairs, ui->actionRegroup_by_Bookmarks, ui->actionRegroup_by_Alternating_Pages, ui->actionRegroup_by_Alternating_Pages_Reversed_Order });
     QToolBar* zoomToolbar = addToolBar(tr("Zoom"));
     zoomToolbar->setObjectName("zoom_toolbar");
     zoomToolbar->addActions({ ui->actionZoom_In, ui->actionZoom_Out });
@@ -111,7 +120,7 @@ MainWindow::MainWindow(QWidget* parent) :
     for (QToolBar* toolbar : toolbars)
     {
         toolbar->setIconSize(iconSize);
-        ui->menuWindow->addAction(toolbar->toggleViewAction());
+        ui->menuToolbars->addAction(toolbar->toggleViewAction());
     }
 
     connect(&m_mapper, QOverload<int>::of(&QSignalMapper::mapped), this, &MainWindow::onMappedActionTriggered);
@@ -341,6 +350,31 @@ bool MainWindow::canPerformOperation(Operation operation) const
         case Operation::About:
             return true;
 
+        case Operation::InvertSelection:
+            return !isModelEmpty;
+
+        case Operation::RegroupEvenOdd:
+        {
+            PageItemModel::SelectionInfo info = m_model->getSelectionInfo(selection);
+            return info.isDocumentOnly();
+        }
+
+        case Operation::RegroupPaired:
+            return !isModelEmpty && !selection.isEmpty();
+
+        case Operation::RegroupBookmarks:
+        {
+            PageItemModel::SelectionInfo info = m_model->getSelectionInfo(selection);
+            return info.isSingleDocument();
+        }
+
+        case Operation::RegroupAlternatingPages:
+        case Operation::RegroupAlternatingPagesReversed:
+        {
+            PageItemModel::SelectionInfo info = m_model->getSelectionInfo(selection);
+            return info.isTwoDocuments();
+        }
+
         default:
             Q_ASSERT(false);
             break;
@@ -695,9 +729,58 @@ void MainWindow::performOperation(Operation operation)
             break;
         }
 
+        case Operation::InvertSelection:
+        {
+            QModelIndex rootIndex = ui->documentItemsView->rootIndex();
+
+            QModelIndex firstIndex = rootIndex.child(0, 0);
+            QModelIndex lastIndex = rootIndex.child(rootIndex.model()->rowCount() - 1, 0);
+            QItemSelection selection(firstIndex, lastIndex);
+
+            ui->documentItemsView->selectionModel()->select(selection, QItemSelectionModel::Toggle);
+            break;
+        }
+
+        case Operation::RegroupEvenOdd:
+        {
+            QModelIndexList indexes = ui->documentItemsView->selectionModel()->selection().indexes();
+            m_model->regroupEvenOdd(indexes);
+            break;
+        }
+
+        case Operation::RegroupPaired:
+        {
+            QModelIndexList indexes = ui->documentItemsView->selectionModel()->selection().indexes();
+            m_model->regroupPaired(indexes);
+            break;
+        }
+
+        case Operation::RegroupBookmarks:
+        {
+            QModelIndexList indexes = ui->documentItemsView->selectionModel()->selection().indexes();
+            m_model->regroupBookmarks(indexes);
+            break;
+        }
+
+        case Operation::RegroupAlternatingPages:
+        {
+            QModelIndexList indexes = ui->documentItemsView->selectionModel()->selection().indexes();
+            m_model->regroupAlternatingPages(indexes, false);
+            break;
+        }
+
+        case Operation::RegroupAlternatingPagesReversed:
+        {
+            QModelIndexList indexes = ui->documentItemsView->selectionModel()->selection().indexes();
+            m_model->regroupAlternatingPages(indexes, true);
+            break;
+        }
+
         default:
+        {
             Q_ASSERT(false);
             break;
+        }
     }
 
     updateActions();
diff --git a/Pdf4QtDocPageOrganizer/mainwindow.h b/Pdf4QtDocPageOrganizer/mainwindow.h
index 61f3456..d8dc717 100644
--- a/Pdf4QtDocPageOrganizer/mainwindow.h
+++ b/Pdf4QtDocPageOrganizer/mainwindow.h
@@ -69,6 +69,7 @@ public:
         SelectOdd,
         SelectPortrait,
         SelectLandscape,
+        InvertSelection,
 
         ZoomIn,
         ZoomOut,
@@ -81,6 +82,12 @@ public:
         InsertEmptyPage,
         InsertPDF,
 
+        RegroupEvenOdd,
+        RegroupPaired,
+        RegroupBookmarks,
+        RegroupAlternatingPages,
+        RegroupAlternatingPagesReversed,
+
         GetSource,
         About
     };
diff --git a/Pdf4QtDocPageOrganizer/mainwindow.ui b/Pdf4QtDocPageOrganizer/mainwindow.ui
index 8061783..55f142d 100644
--- a/Pdf4QtDocPageOrganizer/mainwindow.ui
+++ b/Pdf4QtDocPageOrganizer/mainwindow.ui
@@ -96,6 +96,7 @@
     <addaction name="actionSelect_Odd"/>
     <addaction name="actionSelect_Portrait"/>
     <addaction name="actionSelect_Landscape"/>
+    <addaction name="actionInvert_Selection"/>
     <addaction name="separator"/>
     <addaction name="actionZoom_In"/>
     <addaction name="actionZoom_Out"/>
@@ -115,17 +116,28 @@
     <addaction name="actionGet_Source"/>
     <addaction name="actionAbout"/>
    </widget>
-   <widget class="QMenu" name="menuWindow">
+   <widget class="QMenu" name="menuToolbars">
     <property name="title">
-     <string>Window</string>
+     <string>Toolbars</string>
     </property>
    </widget>
+   <widget class="QMenu" name="menuRegroup">
+    <property name="title">
+     <string>Regroup</string>
+    </property>
+    <addaction name="actionRegroup_Even_Odd"/>
+    <addaction name="actionRegroup_by_Page_Pairs"/>
+    <addaction name="actionRegroup_by_Bookmarks"/>
+    <addaction name="actionRegroup_by_Alternating_Pages"/>
+    <addaction name="actionRegroup_by_Alternating_Pages_Reversed_Order"/>
+   </widget>
    <addaction name="menuFile"/>
    <addaction name="menuEdit"/>
    <addaction name="menuInsert"/>
+   <addaction name="menuRegroup"/>
    <addaction name="menuView"/>
    <addaction name="menuMake"/>
-   <addaction name="menuWindow"/>
+   <addaction name="menuToolbars"/>
    <addaction name="menuHelp"/>
   </widget>
   <widget class="QStatusBar" name="statusbar"/>
@@ -489,6 +501,60 @@
     <string>Ctrl+W</string>
    </property>
   </action>
+  <action name="actionRegroup_Even_Odd">
+   <property name="icon">
+    <iconset resource="resources.qrc">
+     <normaloff>:/pdfdocpage/resources/regroup-even-odd.svg</normaloff>:/pdfdocpage/resources/regroup-even-odd.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Regroup by Even/Odd Pages</string>
+   </property>
+  </action>
+  <action name="actionRegroup_by_Page_Pairs">
+   <property name="icon">
+    <iconset resource="resources.qrc">
+     <normaloff>:/pdfdocpage/resources/regroup-pairs.svg</normaloff>:/pdfdocpage/resources/regroup-pairs.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Regroup by Page Pairs</string>
+   </property>
+  </action>
+  <action name="actionRegroup_by_Bookmarks">
+   <property name="icon">
+    <iconset resource="resources.qrc">
+     <normaloff>:/pdfdocpage/resources/regroup-bookmarks.svg</normaloff>:/pdfdocpage/resources/regroup-bookmarks.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Regroup by Bookmarks</string>
+   </property>
+  </action>
+  <action name="actionRegroup_by_Alternating_Pages">
+   <property name="icon">
+    <iconset resource="resources.qrc">
+     <normaloff>:/pdfdocpage/resources/regroup-alternating.svg</normaloff>:/pdfdocpage/resources/regroup-alternating.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Regroup by Alternating Pages</string>
+   </property>
+  </action>
+  <action name="actionRegroup_by_Alternating_Pages_Reversed_Order">
+   <property name="icon">
+    <iconset resource="resources.qrc">
+     <normaloff>:/pdfdocpage/resources/regroup-alternating-reversed.svg</normaloff>:/pdfdocpage/resources/regroup-alternating-reversed.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Regroup by Alternating Pages (Reversed Order)</string>
+   </property>
+  </action>
+  <action name="actionInvert_Selection">
+   <property name="icon">
+    <iconset resource="resources.qrc">
+     <normaloff>:/pdfdocpage/resources/invert-selection.svg</normaloff>:/pdfdocpage/resources/invert-selection.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Invert Selection</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="resources.qrc"/>
diff --git a/Pdf4QtDocPageOrganizer/pageitemmodel.cpp b/Pdf4QtDocPageOrganizer/pageitemmodel.cpp
index 02332dc..834e526 100644
--- a/Pdf4QtDocPageOrganizer/pageitemmodel.cpp
+++ b/Pdf4QtDocPageOrganizer/pageitemmodel.cpp
@@ -435,6 +435,25 @@ void PageItemModel::insertEmptyPage(const QModelIndex& index)
     endInsertRows();
 }
 
+std::vector<PageGroupItem::GroupItem> PageItemModel::extractItems(std::vector<PageGroupItem>& items,
+                                                                  const QModelIndexList& selection) const
+{
+    std::vector<PageGroupItem::GroupItem> extractedItems;
+
+    std::vector<int> rows;
+    rows.reserve(selection.size());
+    std::transform(selection.cbegin(), selection.cend(), std::back_inserter(rows), [](const auto& index) { return index.row(); });
+    std::sort(rows.begin(), rows.end(), std::greater<int>());
+
+    for (int row : rows)
+    {
+        extractedItems.insert(extractedItems.begin(), items[row].groups.cbegin(), items[row].groups.cend());
+        items.erase(std::next(items.begin(), row));
+    }
+
+    return extractedItems;
+}
+
 void PageItemModel::rotateLeft(const QModelIndexList& list)
 {
     if (list.isEmpty())
@@ -489,6 +508,176 @@ void PageItemModel::rotateRight(const QModelIndexList& list)
     emit dataChanged(index(rowMin, 0, QModelIndex()), index(rowMax, 0, QModelIndex()));
 }
 
+PageItemModel::SelectionInfo PageItemModel::getSelectionInfo(const QModelIndexList& list) const
+{
+    SelectionInfo info;
+
+    std::set<int> documents;
+    std::set<int> images;
+
+    for (const QModelIndex& index : list)
+    {
+        const PageGroupItem* item = getItem(index);
+
+        if (!item)
+        {
+            continue;
+        }
+
+        for (const PageGroupItem::GroupItem& groupItem : item->groups)
+        {
+            switch (groupItem.pageType)
+            {
+                case pdfdocpage::PT_DocumentPage:
+                    documents.insert(groupItem.documentIndex);
+                    break;
+
+                case pdfdocpage::PT_Image:
+                    images.insert(groupItem.imageIndex);
+                    break;
+
+                case pdfdocpage::PT_Empty:
+                    ++info.blankPageCount;
+                    break;
+
+                default:
+                    Q_ASSERT(false);
+                    break;
+            }
+        }
+    }
+
+    info.documentCount = int(documents.size());
+    info.imageCount = int(images.size());
+
+    return info;
+}
+
+void PageItemModel::regroupEvenOdd(const QModelIndexList& list)
+{
+    if (list.empty())
+    {
+        return;
+    }
+
+    std::vector<PageGroupItem> pageGroupItems = m_pageGroupItems;
+    std::vector<PageGroupItem::GroupItem> extractedItems = extractItems(pageGroupItems, list);
+
+    auto it = std::stable_partition(extractedItems.begin(), extractedItems.end(), [](const auto& item) { return item.pageIndex % 2 == 1; });
+    std::vector<PageGroupItem::GroupItem> oddItems(extractedItems.begin(), it);
+    std::vector<PageGroupItem::GroupItem> evenItems(it, extractedItems.end());
+
+    if (!oddItems.empty())
+    {
+        PageGroupItem item;
+        item.groups = std::move(oddItems);
+        updateItemCaptionAndTags(item);
+        pageGroupItems.emplace_back(std::move(item));
+    }
+
+    if (!evenItems.empty())
+    {
+        PageGroupItem item;
+        item.groups = std::move(evenItems);
+        updateItemCaptionAndTags(item);
+        pageGroupItems.emplace_back(std::move(item));
+    }
+
+    if (pageGroupItems != m_pageGroupItems)
+    {
+        beginResetModel();
+        m_pageGroupItems = std::move(pageGroupItems);
+        endResetModel();
+    }
+}
+
+void PageItemModel::regroupPaired(const QModelIndexList& list)
+{
+    if (list.empty())
+    {
+        return;
+    }
+
+    std::vector<PageGroupItem> pageGroupItems = m_pageGroupItems;
+    std::vector<PageGroupItem::GroupItem> extractedItems = extractItems(pageGroupItems, list);
+
+    auto it = extractedItems.begin();
+    while (it != extractedItems.cend())
+    {
+        PageGroupItem item;
+        item.groups = { *it++ };
+
+        if (it != extractedItems.cend())
+        {
+            item.groups.emplace_back(std::move(*it++));
+        }
+
+        updateItemCaptionAndTags(item);
+        pageGroupItems.emplace_back(std::move(item));
+    }
+
+    if (pageGroupItems != m_pageGroupItems)
+    {
+        beginResetModel();
+        m_pageGroupItems = std::move(pageGroupItems);
+        endResetModel();
+    }
+}
+
+void PageItemModel::regroupBookmarks(const QModelIndexList& list)
+{
+    Q_ASSERT(false);
+}
+
+void PageItemModel::regroupAlternatingPages(const QModelIndexList& list, bool reversed)
+{
+    if (list.empty())
+    {
+        return;
+    }
+
+    std::vector<PageGroupItem> pageGroupItems = m_pageGroupItems;
+    std::vector<PageGroupItem::GroupItem> extractedItems = extractItems(pageGroupItems, list);
+    const int documentIndex = extractedItems.front().documentIndex;
+
+    auto it = std::stable_partition(extractedItems.begin(), extractedItems.end(), [documentIndex](const auto& item) { return item.documentIndex == documentIndex; });
+    std::vector<PageGroupItem::GroupItem> firstDocItems(extractedItems.begin(), it);
+    std::vector<PageGroupItem::GroupItem> secondDocItems(it, extractedItems.end());
+
+    if (reversed)
+    {
+        std::reverse(secondDocItems.begin(), secondDocItems.end());
+    }
+
+    auto itF = firstDocItems.begin();
+    auto itS = secondDocItems.begin();
+
+    PageGroupItem item;
+
+    while (itF != firstDocItems.cend() || itS != secondDocItems.cend())
+    {
+        if (itF != firstDocItems.cend())
+        {
+            item.groups.emplace_back(std::move(*itF++));
+        }
+
+        if (itS != secondDocItems.cend())
+        {
+            item.groups.emplace_back(std::move(*itS++));
+        }
+    }
+
+    updateItemCaptionAndTags(item);
+    pageGroupItems.emplace_back(std::move(item));
+
+    if (pageGroupItems != m_pageGroupItems)
+    {
+        beginResetModel();
+        m_pageGroupItems = std::move(pageGroupItems);
+        endResetModel();
+    }
+}
+
 QItemSelection PageItemModel::getSelectionImpl(std::function<bool (const PageGroupItem::GroupItem&)> filter) const
 {
     QItemSelection result;
diff --git a/Pdf4QtDocPageOrganizer/pageitemmodel.h b/Pdf4QtDocPageOrganizer/pageitemmodel.h
index e7cde6f..72c0347 100644
--- a/Pdf4QtDocPageOrganizer/pageitemmodel.h
+++ b/Pdf4QtDocPageOrganizer/pageitemmodel.h
@@ -32,7 +32,8 @@ enum PageType
 {
     PT_DocumentPage,
     PT_Image,
-    PT_Empty
+    PT_Empty,
+    PT_Last
 };
 
 struct PageGroupItem
@@ -167,12 +168,32 @@ public:
     const std::map<int, DocumentItem>& getDocuments() const { return m_documents; }
     const std::map<int, ImageItem>& getImages() const { return m_images; }
 
+    struct SelectionInfo
+    {
+        int documentCount = 0;
+        int imageCount = 0;
+        int blankPageCount = 0;
+
+        bool isDocumentOnly() const { return documentCount > 0 && imageCount == 0 && blankPageCount == 0; }
+        bool isSingleDocument() const { return isDocumentOnly() && documentCount == 1; }
+        bool isTwoDocuments() const { return isDocumentOnly() && documentCount == 2; }
+    };
+
+    SelectionInfo getSelectionInfo(const QModelIndexList& list) const;
+
+    void regroupEvenOdd(const QModelIndexList& list);
+    void regroupPaired(const QModelIndexList& list);
+    void regroupBookmarks(const QModelIndexList& list);
+    void regroupAlternatingPages(const QModelIndexList& list, bool reversed);
+
 private:
     void createDocumentGroup(int index, const QModelIndex& insertIndex);
     QString getGroupNameFromDocument(int index) const;
     void updateItemCaptionAndTags(PageGroupItem& item) const;
     void insertEmptyPage(const QModelIndex& index);
 
+    std::vector<PageGroupItem::GroupItem> extractItems(std::vector<PageGroupItem>& items, const QModelIndexList& selection) const;
+
     QItemSelection getSelectionImpl(std::function<bool(const PageGroupItem::GroupItem&)> filter) const;
 
     std::vector<PageGroupItem> m_pageGroupItems;
diff --git a/Pdf4QtDocPageOrganizer/resources.qrc b/Pdf4QtDocPageOrganizer/resources.qrc
index 5d92f56..de380d4 100644
--- a/Pdf4QtDocPageOrganizer/resources.qrc
+++ b/Pdf4QtDocPageOrganizer/resources.qrc
@@ -30,5 +30,11 @@
         <file>resources/zoom-in.svg</file>
         <file>resources/zoom-out.svg</file>
         <file>resources/clear.svg</file>
+        <file>resources/invert-selection.svg</file>
+        <file>resources/regroup-alternating.svg</file>
+        <file>resources/regroup-alternating-reversed.svg</file>
+        <file>resources/regroup-bookmarks.svg</file>
+        <file>resources/regroup-even-odd.svg</file>
+        <file>resources/regroup-pairs.svg</file>
     </qresource>
 </RCC>
diff --git a/Pdf4QtDocPageOrganizer/resources/invert-selection.svg b/Pdf4QtDocPageOrganizer/resources/invert-selection.svg
new file mode 100644
index 0000000..b78dde2
--- /dev/null
+++ b/Pdf4QtDocPageOrganizer/resources/invert-selection.svg
@@ -0,0 +1,108 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="30mm"
+   height="30mm"
+   viewBox="0 0 30 30"
+   version="1.1"
+   id="svg5291"
+   inkscape:version="0.92.4 (5da689c313, 2019-01-14)"
+   sodipodi:docname="select-all.svg">
+  <defs
+     id="defs5285">
+    <inkscape:perspective
+       sodipodi:type="inkscape:persp3d"
+       inkscape:vp_x="0 : 15 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_z="30 : 15 : 1"
+       inkscape:persp3d-origin="15 : 10 : 1"
+       id="perspective5921" />
+  </defs>
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="5.656854"
+     inkscape:cx="148.43961"
+     inkscape:cy="135.18316"
+     inkscape:document-units="mm"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     inkscape:window-width="3840"
+     inkscape:window-height="2035"
+     inkscape:window-x="-13"
+     inkscape:window-y="-13"
+     inkscape:window-maximized="1" />
+  <metadata
+     id="metadata5288">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+        <dc:creator>
+          <cc:Agent>
+            <dc:title>Jakub Melka</dc:title>
+          </cc:Agent>
+        </dc:creator>
+        <cc:license
+           rdf:resource="http://creativecommons.org/licenses/by-sa/4.0/" />
+      </cc:Work>
+      <cc:License
+         rdf:about="http://creativecommons.org/licenses/by-sa/4.0/">
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#Reproduction" />
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#Distribution" />
+        <cc:requires
+           rdf:resource="http://creativecommons.org/ns#Notice" />
+        <cc:requires
+           rdf:resource="http://creativecommons.org/ns#Attribution" />
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#DerivativeWorks" />
+        <cc:requires
+           rdf:resource="http://creativecommons.org/ns#ShareAlike" />
+      </cc:License>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Vrstva 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(0,-267)">
+    <flowRoot
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diff --git a/Pdf4QtDocPageOrganizer/resources/regroup-pairs.svg b/Pdf4QtDocPageOrganizer/resources/regroup-pairs.svg
new file mode 100644
index 0000000..950c57c
--- /dev/null
+++ b/Pdf4QtDocPageOrganizer/resources/regroup-pairs.svg
@@ -0,0 +1,114 @@
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diff --git a/Pdf4QtLib/sources/pdfdocumentmanipulator.cpp b/Pdf4QtLib/sources/pdfdocumentmanipulator.cpp
index 12603d7..176e5c1 100644
--- a/Pdf4QtLib/sources/pdfdocumentmanipulator.cpp
+++ b/Pdf4QtLib/sources/pdfdocumentmanipulator.cpp
@@ -343,7 +343,7 @@ PDFDocumentManipulator::ProcessedPages PDFDocumentManipulator::collectObjectsAnd
             auto referenceIt = references.begin();
             for (auto currentIt = it; currentIt != itEnd; ++currentIt, ++referenceIt)
             {
-                it->second = *referenceIt;
+                currentIt->second = *referenceIt;
             }
         }