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1989 1990 1991 1992 <span class="md-ellipsis"> 1993 1994 1995 Metadata Schema Validation (Application Layer) 1996 1997 1998 1999 </span> 2000 2001 2002 2003 </a> 2004 </li> 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 <li class="md-nav__item"> 2016 <a href="../strategies/memory-management/" class="md-nav__link"> 2017 2018 2019 2020 <span class="md-ellipsis"> 2021 2022 2023 Memory Management 2024 2025 2026 2027 </span> 2028 2029 2030 2031 </a> 2032 </li> 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 <li class="md-nav__item"> 2044 <a href="../strategies/multi-category-filters/" class="md-nav__link"> 2045 2046 2047 2048 <span class="md-ellipsis"> 2049 2050 2051 Multi-Category/Tag Filters 2052 2053 2054 2055 </span> 2056 2057 2058 2059 </a> 2060 </li> 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 <li class="md-nav__item"> 2072 <a href="../strategies/privacy/" class="md-nav__link"> 2073 2074 2075 2076 <span class="md-ellipsis"> 2077 2078 2079 Privacy Strategies 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md-nav__container"> 2182 <a href="../strategies/multi-tenancy/" class="md-nav__link "> 2183 2184 2185 2186 <span class="md-ellipsis"> 2187 2188 2189 Multi-Tenancy 2190 2191 2192 2193 </span> 2194 2195 2196 2197 </a> 2198 2199 2200 <label class="md-nav__link " for="__nav_6_13" id="__nav_6_13_label" tabindex="0"> 2201 <span class="md-nav__icon md-icon"></span> 2202 </label> 2203 2204 </div> 2205 2206 <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_6_13_label" aria-expanded="false"> 2207 <label class="md-nav__title" for="__nav_6_13"> 2208 <span class="md-nav__icon md-icon"></span> 2209 2210 2211 Multi-Tenancy 2212 2213 2214 </label> 2215 <ul class="md-nav__list" data-md-scrollfix> 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 <li class="md-nav__item"> 2226 <a href="../strategies/multi-tenancy/authorization-model-impl-with-openfga/" class="md-nav__link"> 2227 2228 2229 2230 <span class="md-ellipsis"> 2231 2232 2233 Implementing OpenFGA Authorization Model In Chroma 2234 2235 2236 2237 </span> 2238 2239 2240 2241 </a> 2242 </li> 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 <li class="md-nav__item"> 2254 <a href="../strategies/multi-tenancy/authorization-model-with-openfga/" class="md-nav__link"> 2255 2256 2257 2258 <span class="md-ellipsis"> 2259 2260 2261 Chroma Authorization Model with OpenFGA 2262 2263 2264 2265 </span> 2266 2267 2268 2269 </a> 2270 </li> 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 <li class="md-nav__item"> 2282 <a href="../strategies/multi-tenancy/multi-user-basic-auth/" class="md-nav__link"> 2283 2284 2285 2286 <span class="md-ellipsis"> 2287 2288 2289 Multi-User Basic Auth 2290 2291 2292 2293 </span> 2294 2295 2296 2297 </a> 2298 </li> 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 <li class="md-nav__item"> 2310 <a href="../strategies/multi-tenancy/naive-multi-tenancy/" class="md-nav__link"> 2311 2312 2313 2314 <span class="md-ellipsis"> 2315 2316 2317 Naive Multi-tenancy Strategies 2318 2319 2320 2321 </span> 2322 2323 2324 2325 </a> 2326 </li> 2327 2328 2329 2330 2331 </ul> 2332 </nav> 2333 2334 </li> 2335 2336 2337 2338 2339 </ul> 2340 </nav> 2341 2342 </li> 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 <li class="md-nav__item md-nav__item--nested"> 2372 2373 2374 2375 <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7" > 2376 2377 2378 <div class="md-nav__link md-nav__container"> 2379 <a href="../security/" class="md-nav__link "> 2380 2381 2382 2383 <span class="md-ellipsis"> 2384 2385 2386 Security 2387 2388 2389 2390 </span> 2391 2392 2393 2394 </a> 2395 2396 2397 <label class="md-nav__link " for="__nav_7" id="__nav_7_label" tabindex="0">
2398 <span class="md-nav__icon md-icon"></span> 2399 </label> 2400 2401 </div> 2402 2403 <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_7_label" aria-expanded="false"> 2404 <label class="md-nav__title" for="__nav_7"> 2405 <span class="md-nav__icon md-icon"></span> 2406 2407 2408 Security 2409 2410 2411 </label> 2412 <ul class="md-nav__list" data-md-scrollfix> 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 <li class="md-nav__item"> 2423 <a href="../security/auth-1.0.x/" class="md-nav__link"> 2424 2425 2426 2427 <span class="md-ellipsis"> 2428 2429 2430 Authentication in Chroma v1.0.x 2431 2432 2433 2434 </span> 2435 2436 2437 2438 </a> 2439 </li> 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 <li class="md-nav__item"> 2451 <a href="../security/chroma-ssl-cert/" class="md-nav__link"> 2452 2453 2454 2455 <span class="md-ellipsis"> 2456 2457 2458 SSL/TLS Certificates in Chroma 2459 2460 2461 2462 </span> 2463 2464 2465 2466 </a> 2467 </li> 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 <li class="md-nav__item"> 2479 <a href="../security/legacy-auth/" class="md-nav__link"> 2480 2481 2482 2483 <span class="md-ellipsis"> 2484 2485 2486 Chroma-native Auth (Legacy) 2487 2488 2489 2490 </span> 2491 2492 2493 2494 </a> 2495 </li> 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 <li class="md-nav__item"> 2507 <a href="../security/ssl-proxies/" class="md-nav__link"> 2508 2509 2510 2511 <span class="md-ellipsis"> 2512 2513 2514 SSL/TLS Proxy 2515 2516 2517 2518 </span> 2519 2520 2521 2522 </a> 2523 </li> 2524 2525 2526 2527 2528 </ul> 2529 </nav> 2530 2531 </li> 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 <li class="md-nav__item md-nav__item--nested"> 2551 2552 2553 2554 <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8" > 2555 2556 2557 <label class="md-nav__link" for="__nav_8" id="__nav_8_label" tabindex="0"> 2558 2559 2560 2561 <span class="md-ellipsis"> 2562 2563 2564 Ecosystem 2565 2566 2567 2568 </span> 2569 2570 2571 2572 <span class="md-nav__icon md-icon"></span> 2573 </label> 2574 2575 <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_8_label" aria-expanded="false"> 2576 <label class="md-nav__title" for="__nav_8"> 2577 <span class="md-nav__icon md-icon"></span> 2578 2579 2580 Ecosystem 2581 2582 2583 </label> 2584 <ul class="md-nav__list" data-md-scrollfix> 2585 2586 2587 2588 2589 2590 2591 2592 <li class="md-nav__item"> 2593 <a href="../ecosystem/clients/" class="md-nav__link"> 2594 2595 2596 2597 <span class="md-ellipsis"> 2598 2599 2600 Chroma Ecosystem Clients 2601 2602 2603 2604 </span> 2605 2606 2607 2608 </a> 2609 </li> 2610 2611 2612 2613 2614 </ul> 2615 </nav> 2616 2617 </li> 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 <li class="md-nav__item md-nav__item--nested"> 2639 2640 2641 2642 <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_9" > 2643 2644 2645 <label class="md-nav__link" for="__nav_9" id="__nav_9_label" tabindex="0"> 2646 2647 2648 2649 <span class="md-ellipsis"> 2650 2651 2652 Contributing 2653 2654 2655 2656 </span> 2657 2658 2659 2660 <span class="md-nav__icon md-icon"></span> 2661 </label> 2662 2663 <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_9_label" aria-expanded="false"> 2664 <label class="md-nav__title" for="__nav_9"> 2665 <span class="md-nav__icon md-icon"></span> 2666 2667 2668 Contributing 2669 2670 2671 </label> 2672 <ul class="md-nav__list" data-md-scrollfix> 2673 2674 2675 2676 2677 2678 2679 2680 <li class="md-nav__item"> 2681 <a href="../contributing/getting-started/" class="md-nav__link"> 2682 2683 2684 2685 <span class="md-ellipsis"> 2686 2687 2688 Getting Started with Contributing to Chroma 2689 2690 2691 2692 </span> 2693 2694 2695 2696 </a> 2697 </li> 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 <li class="md-nav__item"> 2709 <a href="../contributing/useful-shortcuts/" class="md-nav__link"> 2710 2711 2712 2713 <span class="md-ellipsis"> 2714 2715 2716 Useful Shortcuts for Contributors 2717 2718 2719 2720 </span> 2721 2722 2723 2724 </a> 2725 </li> 2726 2727 2728 2729 2730 </ul> 2731 </nav> 2732 2733 </li> 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 <li class="md-nav__item md-nav__item--nested"> 2755 2756 2757 2758 <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_10" > 2759 2760 2761 <div class="md-nav__link md-nav__container"> 2762 <a href="../faq/" class="md-nav__link "> 2763 2764 2765 2766 <span class="md-ellipsis"> 2767 2768 2769 FAQ 2770 2771 2772 2773 </span> 2774 2775 2776 2777 </a> 2778 2779 </div> 2780 2781 <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_10_label" aria-expanded="false"> 2782 <label class="md-nav__title" for="__nav_10">
2783 <span class="md-nav__icon md-icon"></span> 2784 2785 2786 FAQ 2787 2788 2789 </label> 2790 <ul class="md-nav__list" data-md-scrollfix> 2791 2792 2793 2794 </ul> 2795 </nav> 2796 2797 </li> 2798 2799 2800 2801 </ul> 2802</nav> 2803 </div> 2804 </div> 2805 </div> 2806 2807 2808 2809 <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" > 2810 <div class="md-sidebar__scrollwrap"> 2811 <div class="md-sidebar__inner"> 2812 2813 2814 2815 2816<nav class="md-nav md-nav--secondary" aria-label="On this page"> 2817 2818 2819 2820 2821 2822 2823 <label class="md-nav__title" for="__toc"> 2824 <span class="md-nav__icon md-icon"></span> 2825 On this page 2826 </label> 2827 <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> 2828 2829 <li class="md-nav__item"> 2830 <a href="#recommended-learning-path" class="md-nav__link"> 2831 <span class="md-ellipsis"> 2832 2833 Recommended Learning Path 2834 2835 </span> 2836 </a> 2837 2838</li> 2839 2840 <li class="md-nav__item"> 2841 <a href="#api-map" class="md-nav__link"> 2842 <span class="md-ellipsis"> 2843 2844 API Map 2845 2846 </span> 2847 </a> 2848 2849 <nav class="md-nav" aria-label="API Map"> 2850 <ul class="md-nav__list"> 2851 2852 <li class="md-nav__item"> 2853 <a href="#client-level-apis" class="md-nav__link"> 2854 <span class="md-ellipsis"> 2855 2856 Client-Level APIs 2857 2858 </span> 2859 </a> 2860 2861</li> 2862 2863 <li class="md-nav__item"> 2864 <a href="#collection-level-apis" class="md-nav__link"> 2865 <span class="md-ellipsis"> 2866 2867 Collection-Level APIs 2868 2869 </span> 2870 </a> 2871 2872</li> 2873 2874 <li class="md-nav__item"> 2875 <a href="#httpopenapi-surface" class="md-nav__link"> 2876 <span class="md-ellipsis"> 2877 2878 HTTP/OpenAPI Surface 2879 2880 </span> 2881 </a> 2882 2883</li> 2884 2885 </ul> 2886 </nav> 2887 2888</li> 2889 2890 <li class="md-nav__item"> 2891 <a href="#minimal-end-to-end-flow-python" class="md-nav__link"> 2892 <span class="md-ellipsis"> 2893 2894 Minimal End-to-End Flow (Python) 2895 2896 </span> 2897 </a> 2898 2899</li> 2900 2901 <li class="md-nav__item"> 2902 <a href="#where-to-go-next" class="md-nav__link"> 2903 <span class="md-ellipsis"> 2904 2905 Where to Go Next 2906 2907 </span> 2908 </a> 2909 2910</li> 2911 2912 </ul> 2913 2914</nav> 2915 </div> 2916 </div> 2917 </div> 2918 2919 2920 2921 <div class="md-content" data-md-component="content"> 2922 2923 <article class="md-content__inner md-typeset"> 2924 2925 2926 2927 2928 2929 2930 2931 2932<h1 id="chroma-core-concepts-and-apis">Chroma Core: Concepts and APIs<a class="headerlink" href="#chroma-core-concepts-and-apis" title="Permanent link">¶</a></h1> 2933<p>This section is the fastest way to understand Chroma's core data model, client choices, and day-to-day APIs.</p> 2934<p>If you are new to Chroma, use the path below in order. If you are already building, jump to the API map.</p> 2935<h2 id="recommended-learning-path">Recommended Learning Path<a class="headerlink" href="#recommended-learning-path" title="Permanent link">¶</a></h2> 2936<ol> 2937<li><a href="concepts/">Concepts</a>: Understand tenants, databases, collections, documents, metadata, embeddings, and query flow.</li> 2938<li><a href="install/">Installation</a>: Install Chroma for local development, server usage, or cloud-connected workflows.</li> 2939<li><a href="clients/">Clients</a>: Pick the right client (<code>PersistentClient</code>, <code>HttpClient</code>, <code>
2939AsyncHttpClient</code>, <code>CloudClient</code>) for your architecture.</li> 2940<li><a href="collections/">Collections</a>: Learn collection lifecycle and core CRUD/query operations.</li> 2941<li><a href="filters/">Filters</a>: Add precise metadata and document filtering to retrieval.</li> 2942<li><a href="configuration/">Configuration</a>: Tune index, runtime, and environment options.</li> 2943<li><a href="resources/">Resources</a>: Estimate memory/CPU/disk needs before scaling.</li> 2944<li><a href="advanced/queries/">Advanced Search</a>: Learn query-stage semantics, ranking, and execution tradeoffs.</li> 2945</ol> 2946<h2 id="api-map">API Map<a class="headerlink" href="#api-map" title="Permanent link">¶</a></h2> 2947<h3 id="client-level-apis">Client-Level APIs<a class="headerlink" href="#client-level-apis" title="Permanent link">¶</a></h3> 2948<ul> 2949<li>Connect to Chroma: <code>PersistentClient</code>, <code>HttpClient</code>, <code>AsyncHttpClient</code>, <code>CloudClient</code></li> 2950<li>Scope data isolation: tenant + database selection</li> 2951<li>Perform admin/list operations (for example collection listing and lifecycle actions)</li> 2952</ul> 2953<p>Start in <a href="clients/">Clients</a>, then use <a href="tenants-and-databases/">Tenants and Databases</a> for multi-tenant setups.</p> 2954<h3 id="collection-level-apis">Collection-Level APIs<a class="headerlink" href="#collection-level-apis" title="Permanent link">¶</a></h3> 2955<ul> 2956<li>Create/get collections: <code>create_collection</code>, <code>get_or_create_collection</code>, <code>get_collection</code></li> 2957<li>Write data: <code>add</code>, <code>upsert</code>, <code>update</code>, <code>delete</code></li> 2958<li>Read data: <code>get</code>, <code>query</code>, <code>count</code></li> 2959<li>Manage collection settings: metadata, index configuration, and cloning/forking patterns</li> 2960</ul> 2961<p>Start in <a href="collections/">Collections</a>, then pair with <a href="filters/">Filters</a> and <a href="document-ids/">Document IDs</a>.</p> 2962<h3 id="httpopenapi-surface">HTTP/OpenAPI Surface<a class="headerlink" href="#httpopenapi-surface" title="Permanent link">¶</a></h3> 2963<ul> 2964<li>Explore server endpoints and OpenAPI: <a href="api/">API</a></li> 2965<li>Generate custom clients when needed</li> 2966</ul> 2967<h2 id="minimal-end-to-end-flow-python">Minimal End-to-End Flow (Python)<a class="headerlink" href="#minimal-end-to-end-flow-python" title="Permanent link">¶</a></h2> 2968<div class="language-python highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">chromadb</span> 2969</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a> 2970</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="n">client</span> <span class="o">=</span> <span class="n">chromadb</span><span class="o">.</span><span class="n">PersistentClient</span><span class="p">(</span><span class="n">path</span><span class="o">=</span><span class="s2">"./chroma"</span><span class="p">)</span> 2971</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="n">collection</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">get_or_create_collection</span><span class="p">(</span><span class="s2">"quickstart"</span><span class="p">)</span> 2972</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a> 2973</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="n">collection</span><span class="o">.</span><span class="n">upsert</span><span class="p">(</span> 2974</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a> <span class="n">ids</span><span class="o">=</span><span class="p">[</span><span class="s2">"doc-1"</span><span class="p">,</span> <span class="s2">"doc-2"</span><span class="p">],</span> 2975</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> <span class="n">documents</span><span class="o">=</span><span class="p">[</span><span class="s2">"Chroma stores vectors and metadata."</span><span class="p">,</span> <span class="s2">"Filters narrow candidate sets before ranking."</span><span class="p">],</span> 2976</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> <span class="n">metadatas</span><span class="o">=</span><span class="p">
2976[{</span><span class="s2">"topic"</span><span class="p">:</span> <span class="s2">"basics"</span><span class="p">},</span> <span class="p">{</span><span class="s2">"topic"</span><span class="p">:</span> <span class="s2">"search"</span><span class="p">}],</span> 2977</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="p">)</span> 2978</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a> 2979</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="n">result</span> <span class="o">=</span> <span class="n">collection</span><span class="o">.</span><span class="n">query</span><span class="p">(</span> 2980</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> <span class="n">query_texts</span><span class="o">=</span><span class="p">[</span><span class="s2">"How do filters affect retrieval?"</span><span class="p">],</span> 2981</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a> <span class="n">where</span><span class="o">=</span><span class="p">{</span><span class="s2">"topic"</span><span class="p">:</span> <span class="s2">"search"</span><span class="p">},</span> 2982</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a> <span class="n">n_results</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> 2983</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="p">)</span> 2984</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a> 2985</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="nb">print</span><span class="p">(</span><span class="n">result</span><span class="p">[</span><span class="s2">"ids"</span><span class="p">])</span> 2986</span></code></pre></div> 2987<h2 id="where-to-go-next">Where to Go Next<a class="headerlink" href="#where-to-go-next" title="Permanent link">¶</a></h2> 2988<ul> 2989<li>Operating local persistent deployments: <a href="storage-layout/">Storage Layout</a>, <a href="advanced/wal/">WAL</a>, <a href="advanced/wal-pruning/">WAL Pruning</a></li> 2990<li>Production guardrails and limits: <a href="system_constraints/">System Constraints</a>, <a href="resources/">Resources</a></li> 2991</ul> 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 <aside class="md-source-file"> 3006 3007 3008 <span class="md-source-file__fact"> 3009 <span class="md-icon" title="Last update"> 3010 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> 3011 </span> 3012 <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="February 24, 2026 10:27:49 UTC">February 24, 2026</span> 3013 </span> 3014 3015 3016 3017 3018 3019 </aside> 3020 3021 3022 3023 3024 3025 3026 3027 3028 </article> 3029 </div> 3030 3031
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