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diff --git a/CITATION.cff b/CITATION.cff
@@ -6,11 +6,13 @@ authors:
     orcid: "https://orcid.org/0000-0003-0637-6028"
 repository-code: "https://github.com/gagolews/datawranglingpy"
 title: "Minimalist Data Wrangling with Python"
+doi: 10.5281/zenodo.6451068
 preferred-citation:
     type: book
     year: 2022
     url: "https://datawranglingpy.gagolewski.com/"
     title: "Minimalist Data Wrangling with Python"
+    doi: 10.5281/zenodo.6451068
     authors:
     -   family-names: Gagolewski
         given-names: Marek

diff --git a/README.md b/README.md
@@ -1,4 +1,5 @@
 # Minimalist Data Wrangling with Python
+# (Open Access Textbook)
 
 > **This is a draft version of a forthcoming book by [Marek Gagolewski][1].
 > Any remarks and bug fixes are appreciated — please submit them via

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diff --git a/docs/_images/violinplot-income-5.png b/docs/_images/violinplot-income-5.png
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diff --git a/docs/_images/wines-15.png b/docs/_images/wines-15.png
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diff --git a/docs/_images/wybory2-9.png b/docs/_images/wybory2-9.png
diff --git a/docs/_static/documentation_options.js b/docs/_static/documentation_options.js
@@ -1,6 +1,6 @@
 var DOCUMENTATION_OPTIONS = {
     URL_ROOT: document.getElementById("documentation_options").getAttribute('data-url_root'),
-    VERSION: '[DRAFTv0.4.2]',
+    VERSION: '[DRAFTv0.5.1]',
     LANGUAGE: 'None',
     COLLAPSE_INDEX: false,
     BUILDER: 'html',

diff --git a/docs/chapter/000-preface.html b/docs/chapter/000-preface.html
@@ -67,7 +67,7 @@
 
 
 
-            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.4.2]
+            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.5.1]
 
 
 
@@ -177,7 +177,7 @@
       <nav class="wy-nav-top" aria-label="top navigation">
 
           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
-          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.4.2]</a>
+          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.5.1]</a>
 
       </nav>
 
@@ -580,7 +580,7 @@ <h2>Acknowledgements<a class="headerlink" href="#acknowledgements" title="Permal
     <p>
         &#169; Copyright 2022, Marek Gagolewski. Licensed under CC BY-NC-ND 4.0.
       <span class="lastupdated">
-        Last updated on 2022-06-03T13:05:59+1000.
+        Last updated on 2022-06-13T15:25:17+1000.
       </span>
     Built with <a href="https://sphinx-doc.org/">Sphinx</a>
     and a customised <a href="https://github.com/rtfd/sphinx_rtd_theme">rtd</a> theme.

diff --git a/docs/chapter/110-setup.html b/docs/chapter/110-setup.html
@@ -69,7 +69,7 @@
 
 
 
-            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.4.2]
+            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.5.1]
 
 
 
@@ -186,7 +186,7 @@
       <nav class="wy-nav-top" aria-label="top navigation">
 
           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
-          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.4.2]</a>
+          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.5.1]</a>
 
       </nav>
 
@@ -622,16 +622,16 @@ <h2><span class="section-number">1.3. </span>Best Note Taking App<a class="heade
 </thead>
 <tbody>
 <tr class="row-even"><td><p><strong class="program">numpy</strong></p></td>
-<td><p>1.22.2</p></td>
+<td><p>1.22.4</p></td>
 </tr>
 <tr class="row-odd"><td><p><strong class="program">scipy</strong></p></td>
-<td><p>1.7.3</p></td>
+<td><p>1.8.1</p></td>
 </tr>
 <tr class="row-even"><td><p><strong class="program">pandas</strong></p></td>
-<td><p>1.4.1</p></td>
+<td><p>1.4.2</p></td>
 </tr>
 <tr class="row-odd"><td><p><strong class="program">matplotlib</strong></p></td>
-<td><p>3.5.1</p></td>
+<td><p>3.5.2</p></td>
 </tr>
 <tr class="row-even"><td><p><strong class="program">seaborn</strong></p></td>
 <td><p>0.11.2</p></td>
@@ -721,7 +721,7 @@ <h2><span class="section-number">1.6. </span>Exercises<a class="headerlink" href
     <p>
         &#169; Copyright 2022, Marek Gagolewski. Licensed under CC BY-NC-ND 4.0.
       <span class="lastupdated">
-        Last updated on 2022-06-03T13:05:59+1000.
+        Last updated on 2022-06-13T15:25:17+1000.
       </span>
     Built with <a href="https://sphinx-doc.org/">Sphinx</a>
     and a customised <a href="https://github.com/rtfd/sphinx_rtd_theme">rtd</a> theme.

diff --git a/docs/chapter/120-scalar.html b/docs/chapter/120-scalar.html
@@ -69,7 +69,7 @@
 
 
 
-            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.4.2]
+            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.5.1]
 
 
 
@@ -200,7 +200,7 @@
       <nav class="wy-nav-top" aria-label="top navigation">
 
           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
-          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.4.2]</a>
+          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.5.1]</a>
 
       </nav>
 
@@ -938,7 +938,7 @@ <h2><span class="section-number">2.5. </span>Exercises<a class="headerlink" href
     <p>
         &#169; Copyright 2022, Marek Gagolewski. Licensed under CC BY-NC-ND 4.0.
       <span class="lastupdated">
-        Last updated on 2022-06-03T13:05:59+1000.
+        Last updated on 2022-06-13T15:25:17+1000.
       </span>
     Built with <a href="https://sphinx-doc.org/">Sphinx</a>
     and a customised <a href="https://github.com/rtfd/sphinx_rtd_theme">rtd</a> theme.

diff --git a/docs/chapter/130-sequential.html b/docs/chapter/130-sequential.html
@@ -67,7 +67,7 @@
 
 
 
-            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.4.2]
+            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.5.1]
 
 
 
@@ -203,7 +203,7 @@
       <nav class="wy-nav-top" aria-label="top navigation">
 
           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
-          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.4.2]</a>
+          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.5.1]</a>
 
       </nav>
 
@@ -988,7 +988,7 @@ <h3><span class="section-number">3.5.3. </span>Object Copies<a class="headerlink
 <span class="kn">import</span> <span class="nn">random</span>
 <span class="n">random</span><span class="o">.</span><span class="n">shuffle</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>  <span class="c1"># modifies x in-place</span>
 <span class="nb">print</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
-<span class="c1">## [4, 1, 2, 3, 5]</span>
+<span class="c1">## [3, 4, 2, 1, 5]</span>
 </pre></div>
 </div>
 <p>Moreover, later we will learn about <code class="docutils literal notranslate"><span class="pre">Series</span></code> objects in <strong class="program">pandas</strong>,
@@ -1122,7 +1122,7 @@ <h2><span class="section-number">3.7. </span>Exercises<a class="headerlink" href
     <p>
         &#169; Copyright 2022, Marek Gagolewski. Licensed under CC BY-NC-ND 4.0.
       <span class="lastupdated">
-        Last updated on 2022-06-03T13:05:59+1000.
+        Last updated on 2022-06-13T15:25:17+1000.
       </span>
     Built with <a href="https://sphinx-doc.org/">Sphinx</a>
     and a customised <a href="https://github.com/rtfd/sphinx_rtd_theme">rtd</a> theme.

diff --git a/docs/chapter/210-vector.html b/docs/chapter/210-vector.html
@@ -69,7 +69,7 @@
 
 
 
-            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.4.2]
+            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.5.1]
 
 
 
@@ -196,7 +196,7 @@
       <nav class="wy-nav-top" aria-label="top navigation">
 
           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
-          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.4.2]</a>
+          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.5.1]</a>
 
       </nav>
 
@@ -1215,7 +1215,7 @@ <h2><span class="section-number">4.4. </span>Exercises<a class="headerlink" href
     <p>
         &#169; Copyright 2022, Marek Gagolewski. Licensed under CC BY-NC-ND 4.0.
       <span class="lastupdated">
-        Last updated on 2022-06-03T13:05:59+1000.
+        Last updated on 2022-06-13T15:25:17+1000.
       </span>
     Built with <a href="https://sphinx-doc.org/">Sphinx</a>
     and a customised <a href="https://github.com/rtfd/sphinx_rtd_theme">rtd</a> theme.

diff --git a/docs/chapter/220-transform-vector.html b/docs/chapter/220-transform-vector.html
@@ -69,7 +69,7 @@
 
 
 
-            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.4.2]
+            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.5.1]
 
 
 
@@ -218,7 +218,7 @@
       <nav class="wy-nav-top" aria-label="top navigation">
 
           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
-          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.4.2]</a>
+          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.5.1]</a>
 
       </nav>
 
@@ -814,7 +814,7 @@ <h3><span class="section-number">5.1.3. </span>Measures of Shape (*)<a class="he
 <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">sns</span><span class="o">.</span><span class="n">violinplot</span><span class="p">(</span><span class="n">data</span><span class="o">=</span><span class="n">income</span><span class="p">,</span> <span class="n">orient</span><span class="o">=</span><span class="s2">&quot;h&quot;</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s2">&quot;lightgray&quot;</span><span class="p">)</span>
 <span class="n">plt</span><span class="o">.</span><span class="n">yticks</span><span class="p">([</span><span class="mi">0</span><span class="p">],</span> <span class="p">[</span><span class="s2">&quot;income&quot;</span><span class="p">])</span>
 <span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
-<span class="c1">## ([&lt;matplotlib.axis.YTick object at 0x7fe840983730&gt;], [Text(0, 0, &#39;income&#39;)])</span>
+<span class="c1">## ([&lt;matplotlib.axis.YTick object at 0x7fa67faadc10&gt;], [Text(0, 0, &#39;income&#39;)])</span>
 </pre></div>
 </div>
 <div class="figure align-default" id="id19">
@@ -1020,8 +1020,8 @@ <h3><span class="section-number">5.1.5. </span>Further Methods (*)<a class="head
 <div class="admonition important">
 <p class="admonition-title">Important</p>
 <p>The classical handbook of mathematical functions
-and the (in)equalities related to them is <span id="id8">[<a class="reference internal" href="999-bibliography.html#id127">AS72</a>]</span>,
-see <span id="id9">[<a class="reference internal" href="999-bibliography.html#id128">O+22</a>]</span> for its updated version.</p>
+and the (in)equalities related to them is <span id="id8">[<a class="reference internal" href="999-bibliography.html#id126">AS72</a>]</span>,
+see <span id="id9">[<a class="reference internal" href="999-bibliography.html#id127">O+22</a>]</span> for its updated version.</p>
 </div>
 </div>
 <div class="section" id="arithmetic-operators">
@@ -1793,7 +1793,7 @@ <h3><span class="section-number">5.5.3. </span>Cumulative Sums and Iterated Diff
 </div>
 </div>
 <p>A good introductory reference to the topic of numerical
-inaccuracies is <span id="id10">[<a class="reference internal" href="999-bibliography.html#id131">Gol91</a>]</span>, see also <span id="id11">[<a class="reference internal" href="999-bibliography.html#id130">Hig02</a>, <a class="reference internal" href="999-bibliography.html#id132">Knu97</a>]</span>
+inaccuracies is <span id="id10">[<a class="reference internal" href="999-bibliography.html#id130">Gol91</a>]</span>, see also <span id="id11">[<a class="reference internal" href="999-bibliography.html#id129">Hig02</a>, <a class="reference internal" href="999-bibliography.html#id131">Knu97</a>]</span>
 for a more comprehensive treatment of numerical analysis.</p>
 </div>
 <div class="section" id="vectorising-scalar-operations-with-list-comprehensions">
@@ -2045,7 +2045,7 @@ <h2><span class="section-number">5.6. </span>Exercises<a class="headerlink" href
     <p>
         &#169; Copyright 2022, Marek Gagolewski. Licensed under CC BY-NC-ND 4.0.
       <span class="lastupdated">
-        Last updated on 2022-06-03T13:05:59+1000.
+        Last updated on 2022-06-13T15:25:17+1000.
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diff --git a/docs/chapter/230-distribution.html b/docs/chapter/230-distribution.html
@@ -69,7 +69,7 @@
 
 
 
-            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.4.2]
+            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.5.1]
 
 
 
@@ -200,7 +200,7 @@
       <nav class="wy-nav-top" aria-label="top navigation">
 
           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
-          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.4.2]</a>
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@@ -1526,7 +1526,7 @@ <h2><span class="section-number">6.5. </span>Exercises<a class="headerlink" href
     <p>
         &#169; Copyright 2022, Marek Gagolewski. Licensed under CC BY-NC-ND 4.0.
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diff --git a/docs/chapter/310-matrix.html b/docs/chapter/310-matrix.html
@@ -69,7 +69,7 @@
 
 
 
-            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.4.2]
+            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.5.1]
 
 
 
@@ -195,7 +195,7 @@
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           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
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+          <a href="../index.html">Minimalist Data Wrangling with Python [DRAFTv0.5.1]</a>
 
       </nav>
 
@@ -1198,7 +1198,7 @@ <h2><span class="section-number">7.5. </span>Exercises<a class="headerlink" href
     <p>
         &#169; Copyright 2022, Marek Gagolewski. Licensed under CC BY-NC-ND 4.0.
       <span class="lastupdated">
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diff --git a/docs/chapter/320-transform-matrix.html b/docs/chapter/320-transform-matrix.html
@@ -69,7 +69,7 @@
 
 
 
-            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.4.2]
+            <a href="../index.html"> Minimalist Data Wrangling with Python [DRAFTv0.5.1]
 
 
 
@@ -205,7 +205,7 @@
       <nav class="wy-nav-top" aria-label="top navigation">
 
           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
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@@ -744,9 +744,8 @@ <h3><span class="section-number">8.1.4. </span>Other Row and Column Transforms (
 </div>
 <div class="section" id="matrix-indexing">
 <span id="sec-matrix-indexing"></span><h2><span class="section-number">8.2. </span>Matrix Indexing<a class="headerlink" href="#matrix-indexing" title="Permalink to this headline"></a></h2>
-<p>Recall that for 1-dimensional arrays we have
-4 possible choices of an indexer
-(i.e., where performing filtering like <code class="docutils literal notranslate"><span class="pre">x[i]</span></code>):</p>
+<p>Recall that for 1-dimensional arrays we have four possible choices
+of indexers (i.e., where performing filtering like <code class="docutils literal notranslate"><span class="pre">x[i]</span></code>):</p>
 <ul class="simple">
 <li><p>scalar (extracts a single element),</p></li>
 <li><p>slice (selects a regular subsequence, e.g., every 2nd element
@@ -968,7 +967,7 @@ <h3><span class="section-number">8.2.6. </span>Adding and Modifying Rows or Colu
 <span id="sec-matrix-multiply"></span><h2><span class="section-number">8.3. </span>Matrix Multiplication, Dot Products, and the Euclidean Norm<a class="headerlink" href="#matrix-multiplication-dot-products-and-the-euclidean-norm" title="Permalink to this headline"></a></h2>
 <p>Matrix algebra is at the core of most methods used in data analysis
 and matrix multiply is one of the most fundamental operations therein
-(e.g., <span id="id1">[<a class="reference internal" href="999-bibliography.html#id70">DFO20</a>, <a class="reference internal" href="999-bibliography.html#id126">Gen17</a>]</span>).</p>
+(e.g., <span id="id1">[<a class="reference internal" href="999-bibliography.html#id70">DFO20</a>, <a class="reference internal" href="999-bibliography.html#id125">Gen17</a>]</span>).</p>
 <p>Given <span class="math notranslate nohighlight">\(\mathbf{A}\in\mathbb{R}^{n\times p}\)</span>
 and <span class="math notranslate nohighlight">\(\mathbf{B}\in\mathbb{R}^{p\times m}\)</span>, their <em>multiply</em> is a matrix
 <span class="math notranslate nohighlight">\(\mathbf{C}=\mathbf{A}\mathbf{B}\in\mathbb{R}^{n\times m}\)</span>
@@ -1373,7 +1372,7 @@ <h3><span class="section-number">8.4.1. </span>The Euclidean Metric<a class="hea
 </div>
 <div class="admonition note">
 <p class="admonition-title">Note</p>
-<p>(**) A bag plot <span id="id5">[<a class="reference internal" href="999-bibliography.html#id129">RRT99</a>]</span>
+<p>(**) A bag plot <span id="id5">[<a class="reference internal" href="999-bibliography.html#id128">RRT99</a>]</span>
 is one of the possible multidimensional generalisations
 of the box-and-whisker plot. Unfortunately, its use is quite limited
 due its low popularity amongst practitioners.</p>
@@ -1660,7 +1659,7 @@ <h2><span class="section-number">8.5. </span>Exercises<a class="headerlink" href
     <p>
         &#169; Copyright 2022, Marek Gagolewski. Licensed under CC BY-NC-ND 4.0.
       <span class="lastupdated">
-        Last updated on 2022-06-03T13:05:59+1000.
+        Last updated on 2022-06-13T15:25:17+1000.
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