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<div id="app"><div class="Layout" data-v-a9a9e638><!--[--><!--]--><!--[--><span tabindex="-1" data-v-492508fc></span><a href="#VPContent" class="VPSkipLink visually-hidden" data-v-492508fc>Skip to content</a><!--]--><!----><header class="VPNav" data-v-a9a9e638 data-v-f1e365da><div class="VPNavBar" data-v-f1e365da data-v-822684d1><div class="wrapper" data-v-822684d1><div class="container" data-v-822684d1><div class="title" data-v-822684d1><div class="VPNavBarTitle has-sidebar" data-v-822684d1 data-v-0f4f798b><a class="title" href="/sigpro/" data-v-0f4f798b><!--[--><!--]--><!--[--><img class="VPImage logo" src="/sigpro/logo.svg" alt data-v-35a7d0b8><!--]--><span data-v-0f4f798b>SigPro</span><!--[--><!--]--></a></div></div><div class="content" data-v-822684d1><div class="content-body" data-v-822684d1><!--[--><!--]--><div class="VPNavBarSearch search" data-v-822684d1><!----></div><nav aria-labelledby="main-nav-aria-label" class="VPNavBarMenu menu" data-v-822684d1 data-v-e6d46098><span 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tabindex="-1" data-v-18756405><span class="visually-hidden" id="sidebar-aria-label" data-v-18756405> Sidebar Navigation </span><!--[--><!--]--><!--[--><div class="no-transition group" data-v-9e426adc><section class="VPSidebarItem level-0" data-v-9e426adc data-v-a4b0d9bf><div class="item" role="button" tabindex="0" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><h2 class="text" data-v-a4b0d9bf>Introduction</h2><!----></div><div class="items" data-v-a4b0d9bf><!--[--><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/install.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>Installation</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/vite/plugin.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>Vite Plugin</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-9e426adc><section class="VPSidebarItem level-0 has-active" data-v-9e426adc data-v-a4b0d9bf><div class="item" role="button" tabindex="0" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><h2 class="text" data-v-a4b0d9bf>API Reference</h2><!----></div><div class="items" data-v-a4b0d9bf><!--[--><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/quick.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>Quick Start</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/signal.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/effect.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$.effect</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/ignore.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$.ignore</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/view.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$.view</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/html.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$.html</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/router.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$.router</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/mount.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$.mount</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/tags.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>Tags</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-9e426adc><section class="VPSidebarItem level-0" data-v-9e426adc data-v-a4b0d9bf><div class="item" role="button" tabindex="0" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><h2 class="text" data-v-a4b0d9bf>UI Components</h2><!----></div><div class="items" data-v-a4b0d9bf><!--[--><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/ui/quick.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>Quick Start</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-a9a9e638 data-v-91765379><div class="VPDoc has-sidebar has-aside" data-v-91765379 data-v-83890dd9><!--[--><!--]--><div class="container" data-v-83890dd9><div class="aside" data-v-83890dd9><div class="aside-curtain" data-v-83890dd9></div><div class="aside-container" data-v-83890dd9><div class="aside-content" data-v-83890dd9><div class="VPDocAside" data-v-83890dd9 data-v-6d7b3c46><!--[--><!--]--><!--[--><!--]--><nav aria-labelledby="doc-outline-aria-label" class="VPDocAsideOutline" data-v-6d7b3c46 data-v-b38bf2ff><div class="content" data-v-b38bf2ff><div class="outline-marker" data-v-b38bf2ff></div><div aria-level="2" class="outline-title" id="doc-outline-aria-label" role="heading" data-v-b38bf2ff>On this page</div><ul class="VPDocOutlineItem root" data-v-b38bf2ff data-v-3f927ebe><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" data-v-6d7b3c46></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-83890dd9><div class="content-container" data-v-83890dd9><!--[--><!--]--><main class="main" data-v-83890dd9><div style="position:relative;" class="vp-doc _sigpro_api_view" data-v-83890dd9><div><h1 id="🖼️-component-lifecycle-view" tabindex="-1">🖼️ Component Lifecycle: <code>$.view( )</code> <a class="header-anchor" href="#🖼️-component-lifecycle-view" aria-label="Permalink to &quot;🖼️ Component Lifecycle: `$.view( )`&quot;"></a></h1><p>The <code>$.view</code> function is a specialized wrapper used to manage the lifecycle of a UI component. It tracks all signals, effects, and DOM elements created within it, providing a single point of destruction to prevent memory leaks.</p><h2 id="🛠-function-signature" tabindex="-1">🛠 Function Signature <a class="header-anchor" href="#🛠-function-signature" aria-label="Permalink to &quot;🛠 Function Signature&quot;"></a></h2><div class="language-typescript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">typescript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">$.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">view</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(renderFn: Function): RuntimeObject</span></span></code></pre></div><table tabindex="0"><thead><tr><th style="text-align:left;">Parameter</th><th style="text-align:left;">Type</th><th style="text-align:left;">Required</th><th style="text-align:left;">Description</th></tr></thead><tbody><tr><td style="text-align:left;"><strong><code>renderFn</code></strong></td><td style="text-align:left;"><code>Function</code></td><td style="text-align:left;">Yes</td><td style="text-align:left;">A function that returns a DOM Node or an array of Nodes.</td></tr></tbody></table><p><strong>Returns:</strong> A <code>Runtime</code> object containing:</p><ul><li><code>container</code>: A <code>div</code> (with <code>display: contents</code>) holding the rendered content.</li><li><code>destroy()</code>: A function that unmounts the view and cleans up all internal effects/listeners.</li></ul><hr><h2 id="📖-usage-patterns" tabindex="-1">📖 Usage Patterns <a class="header-anchor" href="#📖-usage-patterns" aria-label="Permalink to &quot;📖 Usage Patterns&quot;"></a></h2><h3 id="_1-basic-component-wrapper" tabindex="-1">1. Basic Component Wrapper <a class="header-anchor" href="#_1-basic-component-wrapper" aria-label="Permalink to &quot;1. Basic Component Wrapper&quot;"></a></h3><p>When you wrap logic in <code>$.view</code>, SigPro creates a &quot;boundary&quot;.</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> myView</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> $.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">view</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> count</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> </span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // This effect is &quot;owned&quot; by this view</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> $.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">effect</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">count</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()));</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> Div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">([</span></span>
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> H1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;Internal View&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">),</span></span>
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> Button</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">({ </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">onclick</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: () </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> count</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">c</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> c </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">+</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) }, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;Add&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ]);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">});</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// To show it:</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">document.body.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">appendChild</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(myView.container);</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// To kill it (removes from DOM and stops all internal effects):</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">myView.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">destroy</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">();</span></span></code></pre></div><h3 id="_2-manual-cleanups-with-oncleanup" tabindex="-1">2. Manual Cleanups with <code>onCleanup</code> <a class="header-anchor" href="#_2-manual-cleanups-with-oncleanup" aria-label="Permalink to &quot;2. Manual Cleanups with `onCleanup`&quot;"></a></h3><p>The <code>renderFn</code> receives a helper object that allows you to register custom cleanup logic (like closing a WebSocket or a third-party library instance).</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> ChartComponent</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> $.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">view</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(({ </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">onCleanup</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> socket</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> WebSocket</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;ws://...&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> onCleanup</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> socket.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">close</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">();</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;Cleanup: WebSocket closed&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> });</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> Div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">({ class: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;chart-container&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> });</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">});</span></span></code></pre></div><hr><h2 id="🏗️-internal-architecture" tabindex="-1">🏗️ Internal Architecture <a class="header-anchor" href="#🏗️-internal-architecture" aria-label="Permalink to &quot;🏗️ Internal Architecture&quot;"></a></h2><p>When <code>$.view</code> is called, it performs the following:</p><ol><li><strong>Isolation</strong>: It creates a new <code>Set</code> of cleanups.</li><li><strong>Execution</strong>: It runs your function and captures any <code>$.effect</code> or child <code>$.view</code> created during execution.</li><li><strong>Container</strong>: It wraps the result in a <code>display: contents</code> element (which doesn&#39;t affect your CSS layout).</li><li><strong>Disposal</strong>: When <code>destroy()</code> is called, it recursively calls all cleanup functions and removes the container from the DOM.</li></ol><hr><h2 id="💡-why-use-view" tabindex="-1">💡 Why use <code>$.view</code>? <a class="header-anchor" href="#💡-why-use-view" aria-label="Permalink to &quot;💡 Why use `$.view`?&quot;"></a></h2><ul><li><strong>Automatic Cleanup</strong>: You don&#39;t have to manually stop every effect when a user navigates away.</li><li><strong>Router Integration</strong>: The SigPro Router (<code>$.router</code>) uses <code>$.view</code> internally to swap pages and clean up the previous one automatically.</li><li><strong>Performance</strong>: It ensures that background processes (like intervals or observers) stop as soon as the element is no longer visible.</li></ul></div></div></main><footer class="VPDocFooter" data-v-83890dd9 data-v-4f9813fa><!--[--><!--]--><!----><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-4f9813fa><span class="visually-hidden" id="doc-footer-aria-label" data-v-4f9813fa>Pager</span><div class="pager" data-v-4f9813fa><a class="VPLink link pager-link prev" href="/sigpro/api/ignore.html" data-v-4f9813fa><!--[--><span class="desc" data-v-4f9813fa>Previous page</span><span class="title" data-v-4f9813fa>$.ignore</span><!--]--></a></div><div class="pager" data-v-4f9813fa><a class="VPLink link pager-link next" href="/sigpro/api/html.html" data-v-4f9813fa><!--[--><span class="desc" data-v-4f9813fa>Next page</span><span class="title" data-v-4f9813fa>$.html</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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