{"id":14568,"date":"2025-06-20T10:46:00","date_gmt":"2025-06-20T07:46:00","guid":{"rendered":"https:\/\/everhour.com\/blog\/?p=14568"},"modified":"2026-03-21T12:00:33","modified_gmt":"2026-03-21T09:00:33","slug":"littles-law","status":"publish","type":"post","link":"https:\/\/everhour.com\/blog\/littles-law\/","title":{"rendered":"Little&#8217;s Law: Understanding the Fundamentals of Queueing Theory"},"content":{"rendered":"<p>You&#8217;ve read all the books, you&#8217;ve checked the web, but you&#8217;re still struggling to find the perfect way to make your project more efficient. Meet <strong>Little&#8217;s Law theorem<\/strong>, one effective way to streamline your project that you might not have heard of yet.&nbsp;(Tools like <a href=\"https:\/\/everhour.com\/blog\/best-basecamp-time-tracking-integrations\/\" target=\"_blank\" rel=\"noreferrer noopener\">Basecamp time tracking<\/a> can also complement such project management strategies, ensuring that team activities are aligned with expected timelines).<\/p><p>With Little&rsquo;s law formula, you can estimate and turn the queuing processes in your business into a smooth and aligned workflow. It will show you the main system flaws and provide you with insights on how to fix them. In this article, you&rsquo;ll learn:<\/p><ul class=\"wp-block-list\"><li>What is Little&rsquo;s Law?<\/li><li>How to calculate it?<\/li><li>How to apply it in your projects. <\/li><\/ul>\n<style type=\"text\/css\">\n\t#everhour-advanced-banner-block_6426fdc64c4f9 {\n\ttext-align:left;\n\tbackground-color:#f6f5f4;\n\tbackground-position:right bottom;\n\tbackground-repeat:no-repeat;\n\tbackground-size:contain;\n\tbackground-image: url(https:\/\/everhour.com\/blog\/wp-content\/uploads\/2024\/12\/vertical-banner-1@2x.png);\n}\n#everhour-advanced-banner-block_6426fdc64c4f9 .everhour-advanced-banner__title {\n\tcolor:#333333;\n\ttext-align:left;\n}\n#everhour-advanced-banner-block_6426fdc64c4f9 .everhour-advanced-banner__subtitle {\n\tcolor:#333333;\n\ttext-align:left;\n}\n#everhour-advanced-banner-block_6426fdc64c4f9 .everhour-advanced-banner__cta {\n\ttext-align:left;\n}\n#everhour-advanced-banner-block_6426fdc64c4f9 .everhour-advanced-banner__cta .button {\n\tborder-color:#000000;\n\tbackground-color:#000000;\n\tcolor:#FFFFFF;\n\tbox-shadow:0 3px 10px 0 rgba(0, 0, 0, 0.51), inset 0 3px 20px 0 rgba(0, 0, 0, 0.3);;\n}\n#everhour-advanced-banner-block_6426fdc64c4f9 .everhour-advanced-banner__cta .button:hover, #everhour-advanced-banner-block_6426fdc64c4f9 .everhour-advanced-banner__cta .button:active, #everhour-advanced-banner-block_6426fdc64c4f9 .everhour-advanced-banner__cta .button:active:hover {\n\tbackground-color:rgba(255,255,255,0);\n\tcolor:#000000;\n\tbox-shadow:button_hover_shadow;\n}\n#everhour-advanced-banner-block_6426fdc64c4f9 .everhour-advanced-banner__cta .button:active {\n\ttransform:translateY(2px);\n}\n@media (max-width: 480px) {#everhour-advanced-banner-block_6426fdc64c4f9 {background-image: initial;}}<\/style>\n\n<div class=\"everhour-advanced-banner-container\">\n\t<div id=\"everhour-advanced-banner-block_6426fdc64c4f9\" class=\"everhour-advanced-banner banner-style-vertical banner-position-right button-style-lash\">\n\t\t<div class=\"everhour-advanced-banner__content\">\n\t\t\t\t\t\t\t<div class=\"everhour-advanced-banner__title\">Seamlessly track time inside your favorite project management tool<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"everhour-advanced-banner__cta\">\n\t\t\t\t\t<a href=\"https:\/\/everhour.com?utm_source=blog-article&#038;utm_medium=banner&#038;utm_campaign=general-vertical\" class=\"button button--lg button--solid action-button\" type=\"button\" target=\"_blank\">\n\t\t\t\t\t\tIt&#039;s Free to try!\t\t\t\t\t<\/a>\n\n\t\t\t\t\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"21\" height=\"42\" viewBox=\"0 0 21 42\"><g fill=\"none\" fill-rule=\"evenodd\"><g fill=\"#000000\">\n\t\t\t\t\t\t<path d=\"M210.6 174.792c.347-.21.627.01.936.16 2.852 1.383 5.205 3.413 7.392 5.661.503.517.904 1.096 1.072 1.824.087.377.478.73.018 1.109-.505.415-.922.106-1.316-.187-1.238-.919-2.465-1.852-3.697-2.78-.876-.65-1.73-1.328-2.62-1.957-1.034-.73-2.005-1.461-1.93-2.933.015-.316-.248-.659.145-.897zm1.924-13.103c-.114-.65.046-.87.645-.79 3.098.413 6.23.233 9.334.553 1.429.147 2.838.361 4.07 1.172.369.257.648.59.912.936l.314.418.161.207c.246.306.389.543.17.886-.213.332-.474.575-.923.496-.777-.137-1.555-.281-2.338-.375-3.02-.362-6.049-.672-9.066-1.069-1.503-.197-2.948-.543-3.28-2.434zm11.358-19.193c1.025-.282 1.41.91 2.285 1.01.124.015.026.336-.063.507-.151.292-.468.495-.48.92.335.106.513-.038.696-.166.201-.14.382-.48.657-.235.265.235.122.585-.02.838-.163.287-.389.552-.629.783-.895.866-2.051 1.083-3.221 1.184-3.752.325-7.514.457-11.277.569-1.811.054-1.924-.038-2.602-1.613-.66-1.53-.66-1.531 1.053-1.838.296-.053.595-.09.892-.147 1.402-.268 2.82-.432 4.24-.573l1.706-.165c2.274-.218 4.544-.464 6.763-1.074z\" transform=\"translate(-208 -142)\"\/>\n\t\t\t\t\t\t<\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t<\/div>\n<\/div>\n<h2 class=\"wp-block-heading\"><strong><strong>Understanding Little&rsquo;s Law in Queue Management<\/strong><\/strong><\/h2><p>Little&rsquo;s Law is a practical theory for managing queue systems in methods like <a rel=\"noreferrer noopener\" href=\"https:\/\/everhour.com\/blog\/best-project-management-methodologies-compared\/\" target=\"_blank\">Agile and Kanban<\/a>. Once you get it, you&rsquo;ve got a key to estimating and improving any queuing process.<\/p><p>Whether you&#8217;re managing mobile game development or handling customer lines, Little&rsquo;s Law is a useful concept to apply.<\/p><hr class=\"wp-block-separator\"><h2 class=\"wp-block-heading\">Little&rsquo;s Law Definition and History<\/h2><p>&#128216; Little&rsquo;s Law was introduced in 1954 by <strong>John Little<\/strong>, a professor at MIT. Originally used for analyzing queues in shops, the law applies to anything that can form a queue, including software tasks.<\/p><p>&#128736;&#65039; Today, it&rsquo;s used in <strong>project management<\/strong>, <a rel=\"noreferrer noopener\" href=\"https:\/\/everhour.com\/blog\/best-project-management-methodologies-compared\/\" target=\"_blank\">Kanban<\/a> boards, software development, manufacturing, and retail operations.<\/p><figure class=\"wp-block-pullquote\"><blockquote><p>Little&rsquo;s Law states: <br> <strong>&ldquo;The average number of customers in a stationary system (L) is equal to the long-term average effective arrival rate (&lambda;) multiplied by the average time (W) that a customer spends in the system.&rdquo;<\/strong><\/p><\/blockquote><\/figure><p>&#129300; But what does this mean for project management? Let&rsquo;s simplify the terminology so it&rsquo;s easier to apply in your workflow:<\/p><ul class=\"wp-block-list\"><li>&#128257; <strong>L<\/strong> = &ldquo;Customers in a stationary system&rdquo; &rarr; <strong>Work in Progress (WIP)<\/strong><\/li><li>&#128200; <strong>&lambda;<\/strong> = &ldquo;Arrival rate&rdquo; &rarr; <strong>Throughput<\/strong><\/li><li>&#9201;&#65039; <strong>W<\/strong> = &ldquo;Time in the system&rdquo; &rarr; <strong>Lead time<\/strong><\/li><\/ul><p>&#9989; With these updated terms, you can now apply Little&rsquo;s Law to calculate your system&rsquo;s capacity and improve efficiency.<\/p><hr class=\"wp-block-separator\"><h2 class=\"wp-block-heading\">Little&rsquo;s Law Formula<\/h2><p>Now, you&rsquo;ve got the three Little&rsquo;s law variables. So, what&rsquo;s the formula? It&rsquo;s super simple: <\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>L = &lambda; x W<\/p><\/blockquote><ul class=\"wp-block-list\"><li><strong>Work in Progress (L)<\/strong> is the number of items in process in any system.<\/li><li><strong>Throughput (&lambda;)<\/strong> represents the rate at which items arrive in\/out of the system.<\/li><li><strong>Lead time (W) <\/strong>is the average time one item spends in the system.<\/li><\/ul><p>Still, seems a bit complicated? Let&rsquo;s take a look at some real-life examples to add some practical knowledge and visualization to the formula.<\/p><hr class=\"wp-block-separator\"><h2 class=\"wp-block-heading\"><strong>Practical Applications of Little&rsquo;s Law<\/strong><\/h2><p>&#128717;&#65039; Let&rsquo;s apply Little&rsquo;s Law to a real-world example &mdash; a bookstore:<\/p><ol class=\"li-special-grey wp-block-list\"><li>&#128229; You get <strong>10 visitors per hour<\/strong>.<\/li><li>&#128338; Each customer spends about <strong>30 minutes (0.5 hours)<\/strong> browsing before paying and leaving.<\/li><li>&#128202; So, at any given time, you&rsquo;ll have <strong>5 customers in the store<\/strong>.<\/li><\/ol><p>&#128208; How did we calculate that? Let&rsquo;s plug in the values using Little&rsquo;s Law:<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>L = &lambda; &times; W = 10 &times; 0.5 = <strong>5 customers<\/strong><\/p><\/blockquote><p>&#9989; That tells you there&#8217;s no urgent need to hire more staff or expand the space &mdash; your current setup handles the load just fine.<\/p><p>&#128200; But what if 5 customers\/hour isn&#8217;t enough for your business goals? You run a promo and boost traffic to <strong>20 customers\/hour<\/strong>.<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>L = 20 &times; 0.5 = <strong>10 customers<\/strong><\/p><\/blockquote><p>Congrats! You&rsquo;ve doubled in-store activity. But&hellip; uh-oh &mdash; your single cashier is overwhelmed. Time to rethink resources.<\/p><p>&#128101; Hiring another seller may help &mdash; but it also means <strong>double the payroll<\/strong>. If that affects your bottom line, consider <a rel=\"noreferrer noopener\" href=\"https:\/\/everhour.com\/blog\/marginal-revenue\/\" target=\"_blank\">marginal revenue<\/a> strategies to keep profits on track.<\/p><hr class=\"wp-block-separator\"><h2 class=\"wp-block-heading\">Little&rsquo;s Law in Project Management<\/h2><p>&#128202; We&rsquo;ve seen how Little&rsquo;s Law helps guide decisions in business. But how do you apply it in <strong>project management<\/strong>? Easy &mdash; because the most popular methods, like <a rel=\"noreferrer noopener\" href=\"https:\/\/everhour.com\/blog\/best-project-management-methodologies-compared\/\" target=\"_blank\">Kanban and Agile<\/a>, are grounded in its principles (check out the common <a href=\"https:\/\/everhour.com\/blog\/10-project-management-principles-to-follow\/\" target=\"_blank\" rel=\"noreferrer noopener\">project management principles<\/a>).<\/p><p>&#128736;&#65039; In Kanban, the goal is to <strong>limit Work in Progress (WIP)<\/strong>. High WIP increases <a href=\"https:\/\/everhour.com\/blog\/lead-time-vs-cycle-time-vs-takt-time\/\" target=\"_blank\" rel=\"noreferrer noopener\">lead time<\/a>, which slows everything down. So, to meet deadlines more easily &mdash; reduce your WIP.<\/p><p>&#128207; To control WIP, you need to know:<\/p><ul class=\"wp-block-list\"><li>&#128229; Task arrival rate (aka <strong>throughput<\/strong>)<\/li><li>&#9201;&#65039; Average time each task stays in the system (<strong>lead time<\/strong>)<\/li><\/ul><p>Then, apply the formula:<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>WIP = Throughput &times; Lead Time<\/strong><\/p><\/blockquote><p>&#128161; If you know two of the three values, you can always find the third:<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Lead time = WIP \/ Throughput<\/strong><br><strong>Throughput = WIP \/ Lead time<\/strong><\/p><\/blockquote><p>&#9881;&#65039; These equations help your team optimize workflows and boost <a rel=\"noreferrer noopener\" href=\"https:\/\/everhour.com\/blog\/how-to-measure-and-increase-productivity-level-at-your-workplace\/\" target=\"_blank\">productivity<\/a>.<\/p><p>&#127856; Let&rsquo;s break it down with a simple example:<\/p><ul class=\"li-special-grey wp-block-list\"><li>You&#8217;re managing a bakery that makes legendary apple pies.<\/li><li>Five bakers work 8 hours a day and together bake 25 pies daily.<\/li><\/ul><p><strong>&#129383; 5 bakers &times; 8 hours = 25 apple pies<\/strong><\/p><p>Now, demand is rising! You have two ways to scale up:<\/p><ul class=\"wp-block-list\"><li>&#128104;&zwj;&#127859; Hire 5 more bakers &rarr;<\/li><\/ul><p><strong>&#129383; 10 bakers &times; 8 hours = 50 apple pies<\/strong><\/p><ul class=\"wp-block-list\"><li>&#9889; Upgrade your equipment &rarr;<\/li><\/ul><p><strong>&#129383; 5 bakers &times; 4 hours = 50 apple pies<\/strong><\/p><p>&#128640; In both cases, you boost throughput &mdash; but the second option keeps costs stable by avoiding extra salaries.<\/p><hr class=\"wp-block-separator\"><h2 class=\"wp-block-heading\">Little&rsquo;s Law Practice Problems<\/h2><p>When applying Little&rsquo;s Law formula in project estimation, you might run into practical issues. To calculate your project&rsquo;s WIP correctly, your Kanban system must be in a steady state and all three variables must remain consistent.<\/p><p>Daniel S., one of the early contributors to Kanban development, <a href=\"https:\/\/2020.leanability.com\/en\/blog\/2017\/08\/littles-law-and-system-stability\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" class=\"external external_icon\">recommends<\/a> focusing less on the equation and more on the assumptions that make Little&rsquo;s Law valid. Once these conditions are in place, your workflow becomes easier to measure and manage.<\/p><p>To ensure your project workflow is predictable and Little&rsquo;s Law can be applied accurately, your system must meet the following criteria:<\/p><ul class=\"li-special-grey wp-block-list\"><li>Know your average values: lead time (W), WIP (L), and throughput (&lambda;).<\/li><li>Keep units consistent. If you measure lead time in weeks, do the same for WIP and throughput.<\/li><li>Maintain system stability. WIP at the beginning and end of your measurement period should be the same.<\/li><li>Ensure average arrival and departure rates are equal.<\/li><\/ul><hr class=\"wp-block-separator\"><h2 class=\"wp-block-heading\">In Closing<\/h2><p>We, at Everhour, hope that now you know how to apply Little&rsquo;s law in practice, and it&rsquo;ll help you in your future projects to better:<\/p><ul class=\"wp-block-list\"><li>Estimate the performance of your project team (learn more about <a href=\"https:\/\/everhour.com\/blog\/bottom-up-estimating\/\" target=\"_blank\" rel=\"noreferrer noopener\">bottom-up estimating<\/a> here)<\/li><li>Control project WIP and keep it low to meet deadlines on time<\/li><li>Explain in practical cases why multitasking is evil<\/li><li>Meet deadlines<\/li><li>Make accurate predictions on project workflow and workload.<\/li><\/ul>\n<style type=\"text\/css\">\n\t#everhour-advanced-banner-block_609d2cae67cd1 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any workflow.<br> Get useful insights into how you spend your time.<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"everhour-advanced-banner__cta\">\n\t\t\t\t\t<a href=\"https:\/\/everhour.com\/signup?utm_source=article&#038;utm_medium=banner&#038;utm_campaign=blog_article&#038;utm_id=blog2024\" class=\"button button--lg button--solid action-button\" type=\"button\" target=\"_blank\">\n\t\t\t\t\t\tStart your journey!\t\t\t\t\t<\/a>\n\n\t\t\t\t\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"21\" height=\"42\" viewBox=\"0 0 21 42\"><g fill=\"none\" fill-rule=\"evenodd\"><g fill=\"#e8585a\">\n\t\t\t\t\t\t<path d=\"M210.6 174.792c.347-.21.627.01.936.16 2.852 1.383 5.205 3.413 7.392 5.661.503.517.904 1.096 1.072 1.824.087.377.478.73.018 1.109-.505.415-.922.106-1.316-.187-1.238-.919-2.465-1.852-3.697-2.78-.876-.65-1.73-1.328-2.62-1.957-1.034-.73-2.005-1.461-1.93-2.933.015-.316-.248-.659.145-.897zm1.924-13.103c-.114-.65.046-.87.645-.79 3.098.413 6.23.233 9.334.553 1.429.147 2.838.361 4.07 1.172.369.257.648.59.912.936l.314.418.161.207c.246.306.389.543.17.886-.213.332-.474.575-.923.496-.777-.137-1.555-.281-2.338-.375-3.02-.362-6.049-.672-9.066-1.069-1.503-.197-2.948-.543-3.28-2.434zm11.358-19.193c1.025-.282 1.41.91 2.285 1.01.124.015.026.336-.063.507-.151.292-.468.495-.48.92.335.106.513-.038.696-.166.201-.14.382-.48.657-.235.265.235.122.585-.02.838-.163.287-.389.552-.629.783-.895.866-2.051 1.083-3.221 1.184-3.752.325-7.514.457-11.277.569-1.811.054-1.924-.038-2.602-1.613-.66-1.53-.66-1.531 1.053-1.838.296-.053.595-.09.892-.147 1.402-.268 2.82-.432 4.24-.573l1.706-.165c2.274-.218 4.544-.464 6.763-1.074z\" transform=\"translate(-208 -142)\"\/>\n\t\t\t\t\t\t<\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t<\/div>\n<\/div>\n<p><strong>Enjoyed the article?<\/strong>&nbsp;<strong>For more tips, strategies and tools that&rsquo;ll help you make more informed business decisions and better manage your team, check out these publications 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In this article, we examine what imputed income means, provide some examples of imputed income, and how to report imputed income.<\/p>\n<\/div><\/div><div class=\"wp-block-media-text alignwide is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"427\" src=\"https:\/\/everhour.com\/blog\/wp-content\/uploads\/2020\/05\/balance-sheet-template.jpg\" alt=\"understanding little&rsquo;s law &amp; how to apply it\" class=\"wp-image-12654\" srcset=\"https:\/\/everhour.com\/blog\/wp-content\/uploads\/2020\/05\/balance-sheet-template.jpg 640w, https:\/\/everhour.com\/blog\/wp-content\/uploads\/2020\/05\/balance-sheet-template-300x200.jpg 300w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<h5 class=\"wp-block-heading\"><a href=\"https:\/\/everhour.com\/blog\/balance-sheet-template\/\" target=\"_blank\" rel=\"noreferrer noopener\">A Powerful Balance Sheet Template for Your Business<\/a><\/h5>\n\n\n\n<p class=\"small-text\">Balance sheet is essentially a financial statement that captures all assets and liabilities of an organization at a specific point in time, making it easier for you to make major decisions in an informed, rational way. Create one today with our hassle-free balance sheet template!<\/p>\n<\/div><\/div><div class=\"wp-block-media-text alignwide is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"649\" src=\"https:\/\/everhour.com\/blog\/wp-content\/uploads\/2020\/04\/groop-communication-zoom-1024x649.jpg\" alt=\"understanding little&rsquo;s law &amp; how to apply it\" class=\"wp-image-12088\" srcset=\"https:\/\/everhour.com\/blog\/wp-content\/uploads\/2020\/04\/groop-communication-zoom-1024x649.jpg 1024w, https:\/\/everhour.com\/blog\/wp-content\/uploads\/2020\/04\/groop-communication-zoom-300x190.jpg 300w, https:\/\/everhour.com\/blog\/wp-content\/uploads\/2020\/04\/groop-communication-zoom-768x486.jpg 768w, https:\/\/everhour.com\/blog\/wp-content\/uploads\/2020\/04\/groop-communication-zoom.jpg 1440w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<h5 class=\"wp-block-heading\"><a href=\"https:\/\/everhour.com\/blog\/group-communication-working-remotely\/\" target=\"_blank\" rel=\"noreferrer noopener\">Team Communication Best Practices for Remote Work<\/a><\/h5>\n\n\n\n<p class=\"small-text\">Facing the need to run your business remotely? Discover how to facilitate remote team communication, and which strategies and tools work best!<\/p>\n<\/div><\/div><p>Reference:<\/p><ul class=\"li-special-references wp-block-list\"><li>Featured image credit: <a rel=\"noreferrer noopener nofollow\" href=\"http:\/\/velog.io\" target=\"_blank\" class=\"external external_icon\">Velog<\/a><\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>You&#8217;ve read all the books, you&#8217;ve checked the web, but you&#8217;re still struggling to find the perfect way to make your project more efficient. Meet Little&#8217;s Law theorem, one effective way to streamline your project that you might not have heard of yet.&nbsp;(Tools like Basecamp time tracking can also complement such project management strategies, ensuring [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":55834,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[135,132],"tags":[],"class_list":["post-14568","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-productivity","category-management"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Little\u2019s Law: How to Manage Queues and Boost Efficiency<\/title>\n<meta name=\"description\" content=\"Learn how to apply Little\u2019s Law to improve queue management and project workflows. 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