https://lucky-chen.github.io/en/Recent content on Chen's NotesHugoen-USMon, 12 Oct 2026 00:00:00 +0000https://lucky-chen.github.io/en/docs/product/product-engineer/Mon, 12 Oct 2026 00:00:00 +0000https://lucky-chen.github.io/en/docs/product/product-engineer/<h1 id="goal">Goal<a class="anchor" href="#goal" aria-label="Link"></a></h1> <p>Explore a core thesis: product engineering represents a promising career evolution for traditional SDEs in the AI era.</p> <ul> <li>Impact of AI on the traditional SDLC</li> <li>Refocusing SDE capabilities in the AI era</li> <li>Building end-to-end product engineering capabilities</li> </ul>https://lucky-chen.github.io/en/docs/ai/ai-technology-stack/Fri, 17 Jul 2026 00:00:00 +0000https://lucky-chen.github.io/en/docs/ai/ai-technology-stack/<h1 id="ai-technology-stack-overview">AI Technology Stack Overview<a class="anchor" href="#ai-technology-stack-overview" aria-label="Link"></a></h1> <h2 id="layers-and-responsibilities">Layers and Responsibilities<a class="anchor" href="#layers-and-responsibilities" aria-label="Link"></a></h2> <p>This map centers on large language models and organizes the technology stack into four layers: application and orchestration, training and inference frameworks, model architecture and algorithms, and computing and infrastructure. Each layer explains its responsibilities, its connections to other layers, and where to read further.</p> <table> <thead> <tr> <th>Layer</th> <th>Main Question</th> <th>Responsibilities</th> </tr> </thead> <tbody> <tr> <td>Application and orchestration</td> <td>How do models help complete user tasks?</td> <td>Agents, workflows, context, knowledge retrieval, tools, and external systems</td> </tr> <tr> <td>Training and inference frameworks</td> <td>How are training processes organized and models served?</td> <td>Data pipelines, training execution, model deployment, generation execution, and request scheduling</td> </tr> <tr> <td>Model architecture and algorithms</td> <td>How do models represent text, learn parameters, and generate tokens?</td> <td>Tokenizers, Transformers, training objectives, parameter updates, and generation algorithms</td> </tr> <tr> <td>Computing and infrastructure</td> <td>How does model computation run on devices and clusters?</td> <td>Tensor frameworks, operators and acceleration libraries, GPUs, storage, communication, and resource management</td> </tr> </tbody> </table>https://lucky-chen.github.io/en/docs/ai/llm-workflow-with-nanochat/Sun, 10 May 2026 00:00:00 +0000https://lucky-chen.github.io/en/docs/ai/llm-workflow-with-nanochat/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/ai/llm-workflow-with-nanochat/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/crocess-platform-solution/Sat, 21 Sep 2019 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/crocess-platform-solution/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/cross_platform/crocess-platform-solution/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/ai/llm-system-1/Tue, 07 Apr 2026 00:00:00 +0000https://lucky-chen.github.io/en/docs/ai/llm-system-1/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/ai/llm-system-1/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/ai/llm-system-2/Fri, 15 May 2026 00:00:00 +0000https://lucky-chen.github.io/en/docs/ai/llm-system-2/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/ai/llm-system-2/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/ai/llm-system-nanochat/Mon, 25 May 2026 00:00:00 +0000https://lucky-chen.github.io/en/docs/ai/llm-system-nanochat/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/ai/llm-system-nanochat/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/backend/full-stack-tech/Thu, 09 Jul 2026 00:00:00 +0000https://lucky-chen.github.io/en/docs/backend/full-stack-tech/<h1 id="goal">Goal<a class="anchor" href="#goal" aria-label="Link"></a></h1> <p>Get a fast overview of full-stack architecture, with a focus on backend systems.</p> <ol> <li>A high-level architecture and technology stack map for full-stack projects.</li> <li>A flash-sale e-commerce case study to connect the architecture with key backend technologies.</li> <li>Practical references for project technology selection and architecture design.</li> </ol>https://lucky-chen.github.io/en/docs/product/lean-analytics-in-product/Mon, 14 Sep 2026 00:00:00 +0000https://lucky-chen.github.io/en/docs/product/lean-analytics-in-product/<h1 id="goal">Goal<a class="anchor" href="#goal" aria-label="Link"></a></h1> <p>Continuing the product engineer career path discussion, this article helps software engineers build a basic product thinking framework:</p> <ol> <li>What validation stages does product innovation usually go through?</li> <li>What qualitative judgment should be made at each stage?</li> <li>What quantitative metric can be used to validate that judgment?</li> </ol> <p>This article draws on <a href="https://www.amazon.sg/dp/1449335675"><em>Lean Analytics</em></a>, a book on validating innovation that also helps engineers develop product thinking.</p> <p>Recommended by <a href="https://www.oreilly.com/library/view/lean-analytics/9781449335687/apc.html">Kevin Weil</a>, <a href="https://www.oreilly.com/library/view/lean-analytics/9781449335687/pr01.html">Dan Martell</a>, <a href="https://www.sohu.com/a/115328943_358836">Fan Bing</a>, <a href="https://www.woshipm.com/pmd/393383.html">Zhang Ximeng</a>, and <a href="https://tech.sina.cn/csj/2019-03-05/doc-ihsxncvf9865915.d.html">Ding Lei</a>.</p>https://lucky-chen.github.io/en/docs/ai/agent-sdk-design/Mon, 22 Dec 2025 00:00:00 +0000https://lucky-chen.github.io/en/docs/ai/agent-sdk-design/<h1 id="background">Background<a class="anchor" href="#background" aria-label="Link"></a></h1> <p>This article uses an agent SDK as a hands-on introduction to AI application engineering through the following runtime and orchestration requirements:</p> <ul> <li>Runtime execution</li> <li>API boundaries</li> <li>Orchestration and execution control</li> <li>Context management</li> <li>Tool integration</li> <li>Model integration</li> <li>Permissions</li> <li>Observability</li> </ul>https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/dart-compiler/Mon, 12 Jun 2023 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/dart-compiler/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/compiler_vm/dart-compiler/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/about/Thu, 08 Jun 2023 15:57:03 +0000https://lucky-chen.github.io/en/about/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/about/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/dart-vm/Sun, 28 May 2023 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/dart-vm/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/compiler_vm/dart-vm/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/compose/Wed, 15 Feb 2023 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/compose/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/cross_platform/compose/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/compiler-2/Fri, 30 Dec 2022 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/compiler-2/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/compiler_vm/compiler-2/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/compiler-1/Sun, 25 Dec 2022 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/compiler-1/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/compiler_vm/compiler-1/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/flutter-iot/Fri, 15 Jul 2022 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/flutter-iot/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/cross_platform/flutter-iot/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/tools-androidx/Mon, 25 May 2020 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/tools-androidx/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/cross_platform/tools-androidx/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/2d_rendering/flutter-render-pipline-1/Sun, 15 Mar 2020 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/2d_rendering/flutter-render-pipline-1/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/2d_rendering/flutter-render-pipline-1/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/2d_rendering/flutter-render-pipline/Sun, 08 Mar 2020 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/2d_rendering/flutter-render-pipline/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/2d_rendering/flutter-render-pipline/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/flutter-hybrid/Wed, 25 Dec 2019 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/flutter-hybrid/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/cross_platform/flutter-hybrid/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/flutter-engine-startup/Sun, 15 Dec 2019 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/flutter-engine-startup/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/cross_platform/flutter-engine-startup/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/weex-architecture/Wed, 21 Nov 2018 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/weex-architecture/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/cross_platform/weex-architecture/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/backend/concurrent-thread/Sun, 06 Aug 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/backend/concurrent-thread/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/backend/concurrent-thread/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/android_framework/atlas-bundle-load/Mon, 05 Jun 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/android_framework/atlas-bundle-load/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/android_framework/atlas-bundle-load/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/android_framework/atlas-start-2/Sun, 21 May 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/android_framework/atlas-start-2/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/android_framework/atlas-start-2/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/android_framework/atlas-start-1/Wed, 17 May 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/android_framework/atlas-start-1/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/android_framework/atlas-start-1/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/android_framework/atlas-atlas-gradle-apk/Thu, 11 May 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/android_framework/atlas-atlas-gradle-apk/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/android_framework/atlas-atlas-gradle-apk/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/art-dalvik/Wed, 08 Mar 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/art-dalvik/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/compiler_vm/art-dalvik/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/android_framework/android-process-start/Tue, 14 Feb 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/android_framework/android-process-start/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/android_framework/android-process-start/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/android_framework/droid-plugin-receiver/Tue, 07 Feb 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/android_framework/droid-plugin-receiver/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/android_framework/droid-plugin-receiver/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/android_framework/droid-plugin-provider/Wed, 01 Feb 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/android_framework/droid-plugin-provider/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/android_framework/droid-plugin-provider/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/android_framework/activity-ams-wms/Wed, 25 Jan 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/android_framework/activity-ams-wms/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/android_framework/activity-ams-wms/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/android_framework/droid-plugin-service/Fri, 20 Jan 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/android_framework/droid-plugin-service/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/android_framework/droid-plugin-service/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/android_framework/droid-plugin-activity/Thu, 05 Jan 2017 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/android_framework/droid-plugin-activity/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/android_framework/droid-plugin-activity/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/jvm-class-load/Sun, 27 Nov 2016 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/jvm-class-load/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/compiler_vm/jvm-class-load/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/jvm-concurrent-singleton/Tue, 15 Nov 2016 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/jvm-concurrent-singleton/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/compiler_vm/jvm-concurrent-singleton/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/jvm-mem-struct/Sun, 06 Nov 2016 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/compiler_vm/jvm-mem-struct/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/compiler_vm/jvm-mem-struct/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/rn-init/Wed, 21 Sep 2016 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/cross_platform/rn-init/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/cross_platform/rn-init/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/client_front_end/android_framework/handle/Thu, 25 Aug 2016 00:00:00 +0000https://lucky-chen.github.io/en/docs/client_front_end/android_framework/handle/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/client_front_end/android_framework/handle/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/backend/http2/Sat, 06 Aug 2016 00:00:00 +0000https://lucky-chen.github.io/en/docs/backend/http2/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/backend/http2/">Read the corresponding Chinese version</a></p>https://lucky-chen.github.io/en/docs/notes/hello-chen/Wed, 06 Jul 2016 00:00:00 +0000https://lucky-chen.github.io/en/docs/notes/hello-chen/<h2 id="english-version-todo">English version: TODO<a class="anchor" href="#english-version-todo" aria-label="Link"></a></h2> <p>This page has not been translated yet.</p> <p><a href="https://lucky-chen.github.io/zh/docs/notes/hello-chen/">Read the corresponding Chinese version</a></p>