update

content/courses/prog-intro/homeworks/sum/SumDouble.java

@@ -0,0 +1,27 @@
+// SumDouble.java
+
+public class SumDouble {
+
+    public static void main(String[] args) {
+        double sum = 0; // int -> double
+        for (String argument : args) {
+            StringBuilder number = new StringBuilder();
+            for (char c : argument.toCharArray()) {
+                if (!Character.isWhitespace(c)) {
+                    number.append(c);
+                } else {
+                    if (!number.isEmpty()) {
+                        sum += Double.parseDouble(number.toString()); // Integer.parseInt -> Double.parseDouble())
+                    }
+                    number = new StringBuilder();
+                }
+            }
+
+            if (!number.isEmpty()) {
+                sum += Double.parseDouble(number.toString()); // Integer.parseInt() -> Double.parseDouble()
+            }
+        }
+
+        System.out.println(sum);
+    }
+}

content/courses/prog-intro/homeworks/sum/_index.md

@@ -503,4 +503,49 @@ Below are some modifications to the code for deeper understanding of basic langu
 
 This modification is fairly easy. All we need to do is to replace all integers with floating point numbers.
 
+> [!NOTE]
+> Here we can see all of the benefits of using `Character.isWhitespace()`, because if we had had for example a set of digits and check if the character is in that set we would need to add `.` (point) to that set to count floating point numbers as well.
+
+So here's the updated code
+
+```java
+// SumDouble.java
+
+public class SumDouble {
+
+    public static void main(String[] args) {
+        double sum = 0; // int -> double
+        for (String argument : args) {
+            StringBuilder number = new StringBuilder();
+            for (char c : argument.toCharArray()) {
+                if (!Character.isWhitespace(c)) {
+                    number.append(c);
+                } else {
+                    if (!number.isEmpty()) {
+                        sum += Double.parseDouble(number.toString()); // Integer.parseInt -> Double.parseDouble())
+                    }
+                    number = new StringBuilder();
+                }
+            }
+
+            if (!number.isEmpty()) {
+                sum += Double.parseDouble(number.toString()); // Integer.parseInt() -> Double.parseDouble()
+            }
+        }
+
+        System.out.println(sum);
+    }
+}
+```
+
+This code will work fine and pass all the tests, but can we improve it?
+
+We can see repeating part of code here
+
+```java
+if (!number.isEmpty()) {
+    sum += Double.parseDouble(number.toString()); // Integer.parseInt() -> Double.parseDouble()
+}
+```
+
 ---

layouts/partials/footer.html

@@ -0,0 +1 @@
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@@ -370,13 +370,8 @@
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+
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public/courses/prog-intro/homeworks/index.html

@@ -370,13 +370,8 @@
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+      
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+
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public/courses/prog-intro/homeworks/sum/SumDouble.java

@@ -0,0 +1,27 @@
+// SumDouble.java
+
+public class SumDouble {
+
+    public static void main(String[] args) {
+        double sum = 0; // int -> double
+        for (String argument : args) {
+            StringBuilder number = new StringBuilder();
+            for (char c : argument.toCharArray()) {
+                if (!Character.isWhitespace(c)) {
+                    number.append(c);
+                } else {
+                    if (!number.isEmpty()) {
+                        sum += Double.parseDouble(number.toString()); // Integer.parseInt -> Double.parseDouble())
+                    }
+                    number = new StringBuilder();
+                }
+            }
+
+            if (!number.isEmpty()) {
+                sum += Double.parseDouble(number.toString()); // Integer.parseInt() -> Double.parseDouble()
+            }
+        }
+
+        System.out.println(sum);
+    }
+}

public/courses/prog-intro/homeworks/sum/index.html

@@ -35,7 +35,7 @@ java Sum 1 2 -3 Expected output: 0." /><link rel="canonical" href="http://localh
 Examples:
 java Sum 1 2 3 Expected output: 6.
 java Sum 1 2 -3 Expected output: 0.">
-  <meta itemprop="wordCount" content="2072">
+  <meta itemprop="wordCount" content="2236">
   <meta name="twitter:card" content="summary">
   <meta name="twitter:title" content="Sum">
   <meta name="twitter:description" content="Task You need to create a Sum class which will sum integers from command line arguments and output the sum to console.
@@ -1223,6 +1223,68 @@ java Sum 1 2 -3 Expected output: 0.">
 </ul>
 <h2>Solution<span class="hx:absolute hx:-mt-20" id="solution-1"></span>
     <a href="#solution-1" class="subheading-anchor" aria-label="Permalink for this section"></a></h2><p>This modification is fairly easy. All we need to do is to replace all integers with floating point numbers.</p>
+<div class="hx:overflow-x-auto hx:mt-6 hx:flex hx:flex-col hx:rounded-lg hx:border hx:py-4 hx:px-4 hx:border-gray-200 hx:contrast-more:border-current hx:contrast-more:dark:border-current hx:border-blue-200 hx:bg-blue-100 hx:text-blue-900 hx:dark:border-blue-200/30 hx:dark:bg-blue-900/30 hx:dark:text-blue-200">
+  <p class="hx:flex hx:items-center hx:font-medium"><svg height=16px class="hx:inline-block hx:align-middle hx:mr-2" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/></svg>Note</p>
+
+  <div class="hx:w-full hx:min-w-0 hx:leading-7">
+    <div class="hx:mt-6 hx:leading-7 hx:first:mt-0"><p>Here we can see all of the benefits of using <code>Character.isWhitespace()</code>, because if we had had for example a set of digits and check if the character is in that set we would need to add <code>.</code> (point) to that set to count floating point numbers as well.</p></div>
+  </div>
+</div>
+<p>So here&rsquo;s the updated code</p>
+<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
+
+<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#75715e">// SumDouble.java</span>
+</span></span><span style="display:flex;"><span>
+</span></span><span style="display:flex;"><span><span style="color:#66d9ef">public</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">SumDouble</span> {
+</span></span><span style="display:flex;"><span>
+</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">public</span> <span style="color:#66d9ef">static</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">main</span>(String<span style="color:#f92672">[]</span> args) {
+</span></span><span style="display:flex;"><span>        <span style="color:#66d9ef">double</span> sum <span style="color:#f92672">=</span> 0; <span style="color:#75715e">// int -&gt; double</span>
+</span></span><span style="display:flex;"><span>        <span style="color:#66d9ef">for</span> (String argument : args) {
+</span></span><span style="display:flex;"><span>            StringBuilder number <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> StringBuilder();
+</span></span><span style="display:flex;"><span>            <span style="color:#66d9ef">for</span> (<span style="color:#66d9ef">char</span> c : argument.<span style="color:#a6e22e">toCharArray</span>()) {
+</span></span><span style="display:flex;"><span>                <span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>Character.<span style="color:#a6e22e">isWhitespace</span>(c)) {
+</span></span><span style="display:flex;"><span>                    number.<span style="color:#a6e22e">append</span>(c);
+</span></span><span style="display:flex;"><span>                } <span style="color:#66d9ef">else</span> {
+</span></span><span style="display:flex;"><span>                    <span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>number.<span style="color:#a6e22e">isEmpty</span>()) {
+</span></span><span style="display:flex;"><span>                        sum <span style="color:#f92672">+=</span> Double.<span style="color:#a6e22e">parseDouble</span>(number.<span style="color:#a6e22e">toString</span>()); <span style="color:#75715e">// Integer.parseInt -&gt; Double.parseDouble())</span>
+</span></span><span style="display:flex;"><span>                    }
+</span></span><span style="display:flex;"><span>                    number <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> StringBuilder();
+</span></span><span style="display:flex;"><span>                }
+</span></span><span style="display:flex;"><span>            }
+</span></span><span style="display:flex;"><span>
+</span></span><span style="display:flex;"><span>            <span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>number.<span style="color:#a6e22e">isEmpty</span>()) {
+</span></span><span style="display:flex;"><span>                sum <span style="color:#f92672">+=</span> Double.<span style="color:#a6e22e">parseDouble</span>(number.<span style="color:#a6e22e">toString</span>()); <span style="color:#75715e">// Integer.parseInt() -&gt; Double.parseDouble()</span>
+</span></span><span style="display:flex;"><span>            }
+</span></span><span style="display:flex;"><span>        }
+</span></span><span style="display:flex;"><span>
+</span></span><span style="display:flex;"><span>        System.<span style="color:#a6e22e">out</span>.<span style="color:#a6e22e">println</span>(sum);
+</span></span><span style="display:flex;"><span>    }
+</span></span><span style="display:flex;"><span>}</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
+  <button
+    class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
+    title="Copy code"
+  >
+    <div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
+<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
+  </button>
+</div>
+</div>
+<p>This code will work fine and pass all the tests, but can we improve it?</p>
+<p>We can see repeating part of code here</p>
+<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
+
+<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>number.<span style="color:#a6e22e">isEmpty</span>()) {
+</span></span><span style="display:flex;"><span>    sum <span style="color:#f92672">+=</span> Double.<span style="color:#a6e22e">parseDouble</span>(number.<span style="color:#a6e22e">toString</span>()); <span style="color:#75715e">// Integer.parseInt() -&gt; Double.parseDouble()</span>
+</span></span><span style="display:flex;"><span>}</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
+  <button
+    class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
+    title="Copy code"
+  >
+    <div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
+<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
+  </button>
+</div>
+</div>
 <hr>
 
         </div>
@@ -1233,13 +1295,8 @@ java Sum 1 2 -3 Expected output: 0.">
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+
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@@ -370,13 +370,8 @@
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-    <span>Powered by Hextra<svg height=1em class="hx:inline-block hx:ltr:ml-1 hx:rtl:mr-1 hx:align-[-2.5px]" viewBox="0 0 180 180" xmlns="http://www.w3.org/2000/svg" fill="currentColor"><path fill-rule="evenodd" clip-rule="evenodd" d="m 105.50024,22.224647 c -9.59169,-5.537563 -21.40871,-5.537563 -31.000093,0 L 39.054693,42.689119 C 29.463353,48.226675 23.55484,58.460531 23.55484,69.535642 v 40.928918 c 0,11.07542 5.908513,21.3092 15.499853,26.84652 l 35.445453,20.46446 c 9.591313,5.53732 21.408404,5.53732 31.000094,0 l 35.44507,-20.46446 c 9.59131,-5.53732 15.49985,-15.7711 15.49985,-26.84652 V 69.535642 c 0,-11.075111 -5.90854,-21.308967 -15.49985,-26.846523 z M 34.112797,85.737639 c -1.384445,2.397827 -1.384445,5.352099 0,7.749927 l 24.781554,42.922974 c 1.38437,2.39783 3.942853,3.87496 6.711592,3.87496 h 49.563107 c 2.76905,0 5.3273,-1.47713 6.71144,-3.87496 l 24.78194,-42.922974 c 1.38414,-2.397828 1.38414,-5.3521 0,-7.749927 L 121.88049,42.814746 c -1.38414,-2.397828 -3.94239,-3.874964 -6.71144,-3.874964 H 65.605944 c -2.768739,0 -5.327223,1.477059 -6.711592,3.874964 z" style="stroke-width:0.774993" /></svg></span>
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public/index.html

@@ -300,60 +300,8 @@
     </article>
   </div>
 
-      <footer class="hextra-footer hx:bg-gray-100 hx:pb-[env(safe-area-inset-bottom)] hx:dark:bg-neutral-900 hx:print:bg-transparent"><div class="hx:mx-auto hx:flex hx:gap-2 hx:py-2 hx:px-4 hextra-max-footer-width"><div class="hx:flex hx:justify-items-start hx:group" data-theme="light">
+      
-  <button
+
-    title="Change theme"
-    data-state="closed"
-    data-location="bottom"
-    class="hextra-theme-toggle hx:cursor-pointer hx:rounded-md hx:text-left hx:font-medium hx:h-7 hx:px-2 hx:text-xs hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:font-medium hx:text-gray-600 hx:transition-colors hx:dark:text-gray-400 hx:grow"
-    type="button"
-    aria-label="Change theme"
-  >
-    <div class="hx:flex hx:items-center hx:gap-2 hx:capitalize"><svg height=12 class="hx:group-data-[theme=dark]:hidden hx:group-data-[theme=system]:hidden" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z"/></svg><span class="hx:group-data-[theme=dark]:hidden hx:group-data-[theme=system]:hidden">Light</span><svg height=12 class="hx:group-data-[theme=light]:hidden hx:group-data-[theme=system]:hidden" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M20.354 15.354A9 9 0 018.646 3.646 9.003 9.003 0 0012 21a9.003 9.003 0 008.354-5.646z"/></svg><span class="hx:group-data-[theme=light]:hidden hx:group-data-[theme=system]:hidden">Dark</span><svg height=12 class="hx:group-data-[theme=dark]:hidden hx:group-data-[theme=light]:hidden" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"  fill="currentColor">
-  <path d="M 11.996094,2 C 6.4986225,2.0192368 2.03125,6.5024993 2.03125,12 c 0,5.497501 4.4673725,9.980763 9.964844,10 H 12 12.0039 c 5.497471,-0.01924 9.964844,-4.502499 9.964844,-10 0,-5.4975007 -4.467373,-9.9807632 -9.964844,-10 H 12 Z M 12,4 c 4.417218,0.017598 7.96875,3.5822356 7.96875,8 0,4.417764 -3.551532,7.982402 -7.96875,8 z" />
-</svg>
-<span class="hx:group-data-[theme=dark]:hidden hx:group-data-[theme=light]:hidden">System</span></div>
-  </button>
-  <ul
-    class="hextra-theme-toggle-options hx:hidden hx:z-20 hx:max-h-64 hx:overflow-auto hx:rounded-md hx:ring-1 hx:ring-black/5 hx:bg-white hx:py-1 hx:text-sm hx:shadow-lg hx:dark:ring-white/20 hx:dark:bg-neutral-800"
-    style="position: fixed; inset: auto auto 0px 0px; margin: 0px; min-width: 100px;"
-    data-theme="light"
-  >
-    <li class="hx:flex hx:flex-col">
-      <p
-        data-item="light"
-        class="hx:text-gray-800 hx:dark:text-gray-100 hx:hover:bg-primary-50 hx:hover:text-primary-600 hx:hover:dark:bg-primary-500/10 hx:hover:dark:text-primary-600 hx:relative hx:cursor-pointer hx:whitespace-nowrap hx:py-1.5 hx:transition-colors hx:ltr:pl-3 hx:ltr:pr-9 hx:rtl:pr-3 hx:rtl:pl-9"
-      >
-        Light
-         <span class="hx:absolute hx:inset-y-0 hx:flex hx:items-center hx:ltr:right-3 hx:rtl:left-3 hx:group-data-[theme=dark]:hidden hx:group-data-[theme=system]:hidden"><svg height=1em width=1em xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7"/></svg></span>
-      </p>
-    </li>
-    <li class="hx:flex hx:flex-col">
-      <p
-        data-item="dark"
-        class="hx:text-gray-800 hx:dark:text-gray-100 hx:hover:bg-primary-50 hx:hover:text-primary-600 hx:hover:dark:bg-primary-500/10 hx:hover:dark:text-primary-600 hx:relative hx:cursor-pointer hx:whitespace-nowrap hx:py-1.5 hx:transition-colors hx:ltr:pl-3 hx:ltr:pr-9 hx:rtl:pr-3 hx:rtl:pl-9"
-      >
-        Dark
-         <span class="hx:absolute hx:inset-y-0 hx:flex hx:items-center hx:ltr:right-3 hx:rtl:left-3 hx:group-data-[theme=light]:hidden hx:group-data-[theme=system]:hidden"><svg height=1em width=1em xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7"/></svg></span>
-      </p>
-    </li>
-    <li class="hx:flex hx:flex-col">
-      <p
-        data-item="system"
-        class="hx:text-gray-800 hx:dark:text-gray-100 hx:hover:bg-primary-50 hx:hover:text-primary-600 hx:hover:dark:bg-primary-500/10 hx:hover:dark:text-primary-600 hx:relative hx:cursor-pointer hx:whitespace-nowrap hx:py-1.5 hx:transition-colors hx:ltr:pl-3 hx:ltr:pr-9 hx:rtl:pr-3 hx:rtl:pl-9"
-      >
-        System
-         <span class="hx:absolute hx:inset-y-0 hx:flex hx:items-center hx:ltr:right-3 hx:rtl:left-3 hx:group-data-[theme=dark]:hidden hx:group-data-[theme=light]:hidden"><svg height=1em width=1em xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7"/></svg></span>
-      </p>
-    </li>
-  </ul>
-</div></div><hr class="hx:border-gray-200 hx:dark:border-neutral-800" /><div class="hextra-custom-footer hextra-max-footer-width hx:pl-[max(env(safe-area-inset-left),1.5rem)] hx:pr-[max(env(safe-area-inset-right),1.5rem)] hx:text-gray-600 hx:dark:text-gray-400"></div><div
-      class="hextra-max-footer-width hx:mx-auto hx:flex hx:justify-center hx:py-12 hx:pl-[max(env(safe-area-inset-left),1.5rem)] hx:pr-[max(env(safe-area-inset-right),1.5rem)] hx:text-gray-600 hx:dark:text-gray-400 hx:md:justify-start"
-    >
-      <div class="hx:flex hx:w-full hx:flex-col hx:items-center hx:sm:items-start"><div class="hx:font-semibold"><a class="hx:flex hx:text-sm hx:items-center hx:gap-1 hx:text-current" target="_blank" rel="noopener noreferrer" title="Hextra GitHub Homepage" href="https://github.com/imfing/hextra">
-    <span>Powered by Hextra<svg height=1em class="hx:inline-block hx:ltr:ml-1 hx:rtl:mr-1 hx:align-[-2.5px]" viewBox="0 0 180 180" xmlns="http://www.w3.org/2000/svg" fill="currentColor"><path fill-rule="evenodd" clip-rule="evenodd" d="m 105.50024,22.224647 c -9.59169,-5.537563 -21.40871,-5.537563 -31.000093,0 L 39.054693,42.689119 C 29.463353,48.226675 23.55484,58.460531 23.55484,69.535642 v 40.928918 c 0,11.07542 5.908513,21.3092 15.499853,26.84652 l 35.445453,20.46446 c 9.591313,5.53732 21.408404,5.53732 31.000094,0 l 35.44507,-20.46446 c 9.59131,-5.53732 15.49985,-15.7711 15.49985,-26.84652 V 69.535642 c 0,-11.075111 -5.90854,-21.308967 -15.49985,-26.846523 z M 34.112797,85.737639 c -1.384445,2.397827 -1.384445,5.352099 0,7.749927 l 24.781554,42.922974 c 1.38437,2.39783 3.942853,3.87496 6.711592,3.87496 h 49.563107 c 2.76905,0 5.3273,-1.47713 6.71144,-3.87496 l 24.78194,-42.922974 c 1.38414,-2.397828 1.38414,-5.3521 0,-7.749927 L 121.88049,42.814746 c -1.38414,-2.397828 -3.94239,-3.874964 -6.71144,-3.874964 H 65.605944 c -2.768739,0 -5.327223,1.477059 -6.711592,3.874964 z" style="stroke-width:0.774993" /></svg></span>
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