{"id":398,"date":"2023-06-19T14:30:14","date_gmt":"2023-06-19T14:30:14","guid":{"rendered":"https:\/\/physigeek.com\/ko\/%e1%84%8c%e1%85%ae%e1%86%bc%e1%84%80%e1%85%a1%e1%86%ab-%e1%84%89%e1%85%a9%e1%86%a8%e1%84%83%e1%85%a9-4\/"},"modified":"2023-06-19T14:30:14","modified_gmt":"2023-06-19T14:30:14","slug":"%e1%84%8c%e1%85%ae%e1%86%bc%e1%84%80%e1%85%a1%e1%86%ab-%e1%84%89%e1%85%a9%e1%86%a8%e1%84%83%e1%85%a9-4","status":"publish","type":"post","link":"https:\/\/physigeek.com\/ko\/%e1%84%8c%e1%85%ae%e1%86%bc%e1%84%80%e1%85%a1%e1%86%ab-%e1%84%89%e1%85%a9%e1%86%a8%e1%84%83%e1%85%a9-4\/","title":{"rendered":"\ud3c9\uade0 \uc18d\ub3c4"},"content":{"rendered":"<p>\uc774 \uae30\uc0ac\uc5d0\uc11c\ub294 \ubb3c\ub9ac\ud559\uc758 \ud3c9\uade0 \uc18d\ub3c4\uac00 \ubb34\uc5c7\uc778\uc9c0 \uc124\uba85\ud569\ub2c8\ub2e4. \ub530\ub77c\uc11c \ud3c9\uade0 \uc18d\ub3c4\ub97c \uacc4\uc0b0\ud558\ub294 \ubc29\ubc95\uacfc \ub354\ubd88\uc5b4 \ud734\ub300\ud3f0\uc758 \ud3c9\uade0 \uc18d\ub3c4\ub97c \uacc4\uc0b0\ud558\ub294 \ud574\uacb0 \ubc29\ubc95\ub3c4 \uc54c\uc544\ubd05\ub2c8\ub2e4. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-la-velocidad-media\"><\/span> \ud3c9\uade0 \uc18d\ub3c4\ub294 \uc5bc\ub9c8\uc785\ub2c8\uae4c?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>\ud3c9\uade0 \uc18d\ub3c4<\/strong> \ub294 \uc6c0\uc9c1\uc774\ub294 \ubb3c\uccb4\uac00 \uc804\uccb4 \uacbd\ub85c\ub97c \ub530\ub77c \uc77c\uc815\ud55c \uc18d\ub3c4\ub85c \uc6c0\uc9c1\uc600\ub2e4\uba74 \uc6c0\uc9c1\uc77c \uc218 \uc788\uc5c8\ub358 \uc18d\ub3c4\uc785\ub2c8\ub2e4. \ub530\ub77c\uc11c \ud3c9\uade0 \uc18d\ub3c4\ub294 \ubcc0\uc704\ub97c \uacbd\uacfc \uc2dc\uac04 \uac04\uaca9\uc73c\ub85c \ub098\ub204\uc5b4 \uacc4\uc0b0\ub429\ub2c8\ub2e4.<\/p>\n<p> \ud3c9\uade0 \uc18d\ub3c4\uc758 \uae30\ud638\ub294 v <sub>m<\/sub> \uc785\ub2c8\ub2e4.<\/p>\n<p> \ubaa8\ub4e0 \uc720\ud615\uc758 \uc18d\ub3c4\uc640 \ub9c8\ucc2c\uac00\uc9c0\ub85c \ud3c9\uade0 \uc18d\ub3c4 \ub2e8\uc704\ub294 \uae38\uc774 \ub2e8\uc704\ub97c \uc2dc\uac04 \ub2e8\uc704\ub85c \ub098\ub208 \uac12\uc785\ub2c8\ub2e4. \ub530\ub77c\uc11c \uad6d\uc81c \uc2dc\uc2a4\ud15c(SI)\uc758 \ud3c9\uade0 \uc18d\ub3c4 \ub2e8\uc704\ub294 \ubbf8\ud130\ub97c \ucd08\ub2f9(m\/s)\ub85c \ub098\ub208 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<p> \ud3c9\uade0 \uc18d\ub3c4\ub294 \ubcc0\uc704, \uc989 \ub05d\uc810\uacfc \uc2dc\uc791\uc810 \uc0ac\uc774\uc758 \uac70\ub9ac\ub9cc \uace0\ub824\ud55c\ub2e4\ub294 \uc810\uc5d0 \uc720\uc758\ud574\uc57c \ud569\ub2c8\ub2e4. \ubaa8\ubc14\uc77c\uc774 \uc774\ub3d9\ud55c \uac70\ub9ac\ub294 \uace0\ub824\ub418\uc9c0 \uc54a\uc73c\uba70, \uc774\ub3d9\ud558\ub294 \uac83\uacfc \ub2e4\ub97c \uc218 \uc788\uc2b5\ub2c8\ub2e4. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Formula-de-la-velocidad-media\"><\/span>\ud3c9\uade0 \uc18d\ub3c4 \uacf5\uc2dd<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> \ud3c9\uade0 \uc18d\ub3c4\ub294 \ubcc0\uc704(\u0394x)\ub97c \uacbd\uacfc \uc2dc\uac04 \uac04\uaca9(\u0394t)\uc73c\ub85c \ub098\ub208 \uac12\uacfc \uac19\uc2b5\ub2c8\ub2e4. \ub530\ub77c\uc11c \ud3c9\uade0 \uc18d\ub3c4\ub97c \uacc4\uc0b0\ud558\ub824\uba74 \ucd5c\uc885 \uc704\uce58\uc640 \ucd08\uae30 \uc704\uce58\uc758 \ucc28\uc774\ub97c \ucd5c\uc885 \uc21c\uac04\uacfc \ucd08\uae30 \uc21c\uac04\uc758 \ucc28\uc774\ub85c \ub098\ub204\uc5b4\uc57c \ud569\ub2c8\ub2e4(v <sub>m<\/sub> = \u0394x\/\u0394t).<\/p>\n<p> \ub530\ub77c\uc11c <strong>\ud3c9\uade0 \uc18d\ub3c4\ub97c \uacc4\uc0b0\ud558\ub294 \uacf5\uc2dd\uc740<\/strong> \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4. <\/p>\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/vitesse-moyenne-1.png\" alt=\"\ud3c9\uade0 \uc18d\ub3c4 \uacf5\uc2dd\" class=\"wp-image-7399\" width=\"209\" height=\"210\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/vitesse-moyenne-1-298x300.png 298w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/vitesse-moyenne-1-150x150.png 150w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/vitesse-moyenne-1.png 395w\" sizes=\"auto, (max-width: 298px) 100vw, 298px\"><\/figure>\n<p style=\"margin-bottom:5px\"> \uae08: <\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-9b0ecc0aeba3ba5faa3c109bd7552d5c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"v_m\" title=\"Rendered by QuickLaTeX.com\" height=\"11\" width=\"21\" style=\"vertical-align: -3px;\"><\/p>\n<p> \ud3c9\uade0 \uc18d\ub3c4\uc785\ub2c8\ub2e4. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-e936d3a449e3ecae93ebb5ae1e61feac_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\Delta x\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"25\" style=\"vertical-align: 0px;\"><\/p>\n<p> \uc624\ud504\uc14b\uc785\ub2c8\ub2e4. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-819ab50990df5adf82bea9dfa75ffff2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\Delta t\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"21\" style=\"vertical-align: 0px;\"><\/p>\n<p> \uc2dc\uac04\uc801 \ubcc0\ud654\uc774\ub2e4. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-5aeb431aea5ca3372dbd215fd619e3dd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x_f\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"18\" style=\"vertical-align: -6px;\"><\/p>\n<p> \ucd5c\uc885 \uc704\uce58\uc785\ub2c8\ub2e4. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-dad27a9703483183e1afd245f5232b83_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x_i\" title=\"Rendered by QuickLaTeX.com\" height=\"11\" width=\"15\" style=\"vertical-align: -3px;\"><\/p>\n<p> \uc2dc\uc791 \uc704\uce58\uc785\ub2c8\ub2e4. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-82d36af17e232807e56da9ccdbbda0d8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"t_f\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"14\" style=\"vertical-align: -6px;\"><\/p>\n<p> \ub9c8\uc9c0\ub9c9 \uc21c\uac04\uc774\ub2e4. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-bf289b768173104db12fe7044c723db4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"t_i\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"11\" style=\"vertical-align: -3px;\"><\/p>\n<p> \ucd08\uae30 \uc21c\uac04\uc774\ub2e4. <\/span><\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ejemplo-del-calculo-de-la-velocidad-media\"><\/span> \ud3c9\uade0 \uc18d\ub3c4 \uacc4\uc0b0\uc758 \uc608<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> \uc774\uc81c \uc6b0\ub9ac\ub294 \ud3c9\uade0 \uc18d\ub3c4\uc758 \uc815\uc758\uc640 \uadf8 \uacf5\uc2dd\uc774 \ubb34\uc5c7\uc778\uc9c0 \uc54c\uc558\uc73c\ub2c8, \uc774\ub7ec\ud55c \uc720\ud615\uc758 \uc18d\ub3c4\uac00 \uc5b4\ub5bb\uac8c \uacc4\uc0b0\ub418\ub294\uc9c0\uc5d0 \ub300\ud55c \uad6c\uccb4\uc801\uc778 \uc608\ub97c \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<ul>\n<li> \uc774\ub3d9\uccb4\uac00 \uc2dc\uac04 t <sub>i<\/sub> =3 s\uc5d0 x <sub>i<\/sub> =2 m \uc704\uce58\uc5d0 \uc788\uace0 \uc2dc\uac04 t <sub>f<\/sub> =6 s\uc5d0 x <sub>f<\/sub> =8 m \uc704\uce58\uc5d0 \uc788\uc744 \ub54c \ud3c9\uade0 \uc18d\ub3c4\ub294 \uc5bc\ub9c8\uc785\ub2c8\uae4c?<\/li>\n<\/ul>\n<p> \ud3c9\uade0 \uc18d\ub3c4 \uac12\uc744 \ucc3e\uc73c\ub824\uba74 \uc704\uc5d0 \ud45c\uc2dc\ub41c \uacf5\uc2dd\uc744 \uc0ac\uc6a9\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-cab169a5ae3592f9cfca59d9946da681_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"v_m=\\cfrac{\\Delta x}{\\Delta t}=\\cfrac{x_f-x_i}{t_f-t_i}\" title=\"Rendered by QuickLaTeX.com\" height=\"45\" width=\"155\" style=\"vertical-align: -18px;\"><\/p>\n<\/p>\n<p> \ub530\ub77c\uc11c \uc6b0\ub9ac\ub294 \ub370\uc774\ud130\ub97c \uacf5\uc2dd\uc5d0 \ub300\uccb4\ud558\uace0 \uc6c0\uc9c1\uc774\ub294 \ubb3c\uccb4\uc758 \ud3c9\uade0 \uc18d\ub3c4\ub97c \uacc4\uc0b0\ud569\ub2c8\ub2e4. <\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-5f96d1a55f799225adc270e8ac800c15_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"v_m=\\cfrac{8-2}{6-3}=\\cfrac{6}{3}=2\\ \\cfrac{m}{s}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"177\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Velocidad-media-y-velocidad-instantanea\"><\/span> \ud3c9\uade0\uc18d\ub3c4\uc640 \uc21c\uac04\uc18d\ub3c4<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> \uc774 \uc139\uc158\uc5d0\uc11c\ub294 \ud3c9\uade0 \uc18d\ub3c4\uc640 \uc21c\uac04 \uc18d\ub3c4\uc758 \ucc28\uc774\uac00 \ubb34\uc5c7\uc778\uc9c0 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc65c\ub0d0\ud558\uba74 \ud3c9\uade0 \uc18d\ub3c4\uc640 \uc21c\uac04 \uc18d\ub3c4\ub294 \uc6b4\ub3d9\ud559\uc5d0\uc11c \uc77c\ubc18\uc801\uc73c\ub85c \uc0ac\uc6a9\ub418\ub294 \ub450 \uac00\uc9c0 \ub2e4\ub978 \uc18d\ub3c4 \uc720\ud615\uc774\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.<\/p>\n<p> <strong>\uc21c\uac04 \uc18d\ub3c4\ub294<\/strong> \uc8fc\uc5b4\uc9c4 \uc21c\uac04\uc5d0 \uc6c0\uc9c1\uc774\ub294 \ubb3c\uccb4\uc758 \uc18d\ub3c4\uc785\ub2c8\ub2e4. \ub530\ub77c\uc11c \uc2e0\uccb4\ub294 \ub9e4 \uc21c\uac04\ub9c8\ub2e4 \ub2e4\ub978 \uc21c\uac04 \uc18d\ub3c4\ub97c \uac00\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p> \ub530\ub77c\uc11c <strong>\ub9e4\uccb4 \uc18d\ub3c4\uc640 \uc21c\uac04 \uc18d\ub3c4\uc758 \ucc28\uc774\ub294<\/strong> \ub9e4\uccb4 \uc18d\ub3c4\ub294 \uc77c\uc815\ud55c \uc18d\ub3c4\ub85c \uc6c0\uc9c1\uc77c \ub54c \ud050\ub97c \uc720\uc9c0\ud558\ub824\ub294 \uc18d\ub3c4\uc774\uace0, \ubc18\ub300\ub85c \uc21c\uac04 \uc18d\ub3c4\ub294 \uc21c\uac04\uc5d0 \ud050\ub97c \uc720\uc9c0\ud558\ub294 \uc18d\ub3c4\ub77c\ub294 \uac83\uc785\ub2c8\ub2e4. \uc2dc\uac04\uc744 \uacb0\uc815\ud569\ub2c8\ub2e4.<\/p>\n<p> \ub530\ub77c\uc11c \ud3c9\uade0 \uc18d\ub3c4\ub97c \uacc4\uc0b0\ud560 \ub54c \uc18d\ub3c4\ub294 \uc5ec\ud589 \ub0b4\ub0b4 \uc77c\uc815\ud558\ub2e4\uace0 \uac00\uc815\ud558\uace0 \uc21c\uac04 \uc18d\ub3c4\ub294 \uac01 \uc21c\uac04\ub9c8\ub2e4 \uacc4\uc0b0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. <\/p>\n<div style=\"background-color:#FFFDE7; padding-top: 10px; padding-bottom: 10px; padding-right: 10px; padding-left: 20px; border: 2.5px dashed #FFB74D; border-radius:20px;\"> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>\ucc38\uace0:<\/strong> <a href=\"https:\/\/physigeek.com\/ko\">\uc21c\uac04 \uc18d\ub3c4\ub780 \ubb34\uc5c7\uc785\ub2c8\uae4c?<\/a> <\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Velocidad-media-y-velocidad-promedio\"><\/span> \ud3c9\uade0 \uc18d\ub3c4\uc640 \ud3c9\uade0 \uc18d\ub3c4<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> \ub9c8\uc9c0\ub9c9\uc73c\ub85c, \ud3c9\uade0 \uc18d\ub3c4\uc640 \ud3c9\uade0 \uc18d\ub3c4\uc758 \ucc28\uc774\uac00 \ubb34\uc5c7\uc778\uc9c0 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc65c\ub0d0\ud558\uba74 \ud3c9\uade0 \uc18d\ub3c4\ub294 \uc885\uc885 \ud63c\ub3d9\ub418\ub294 \ub450 \uac00\uc9c0 \ubb3c\ub9ac\uc801 \uac1c\ub150\uc774\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.<\/p>\n<p> <strong>\ud3c9\uade0 \uc18d\ub3c4<\/strong> \ub294 \uc11c\ub85c \ub2e4\ub978 \ub450 \uc2dc\uac04\uc5d0 \uc6c0\uc9c1\uc774\ub294 \ubb3c\uccb4\uc758 \uc18d\ub3c4\ub97c \uc0b0\uc220 \ud3c9\uade0\ud55c \uac83\uc785\ub2c8\ub2e4. \ub530\ub77c\uc11c \ud3c9\uade0 \uc18d\ub3c4\ub294 \ucd5c\uc885 \uc18d\ub3c4\uc5d0 \ucd08\uae30 \uc18d\ub3c4\ub97c \ub354\ud55c \uac12\uc744 2\ub85c \ub098\ub208 \uac12\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n<p> <strong>\ub530\ub77c\uc11c \ud3c9\uade0 \uc18d\ub3c4\uc640 \ud3c9\uade0 \uc18d\ub3c4\uc758 \ucc28\uc774\ub294<\/strong> \ud3c9\uade0 \uc18d\ub3c4\uac00 \uc774\ub3d9\uc5d0\uc11c \uacc4\uc0b0\ub418\ub294 \ubc18\uba74, \ud3c9\uade0 \uc18d\ub3c4\ub294 \ucd5c\uc885 \uc18d\ub3c4\uc640 \ucd08\uae30 \uc18d\ub3c4\uc5d0\uc11c \uacc4\uc0b0\ub41c\ub2e4\ub294 \uac83\uc785\ub2c8\ub2e4. <\/p>\n<div style=\"background-color:#FFFDE7; padding-top: 10px; padding-bottom: 10px; padding-right: 10px; padding-left: 20px; border: 2.5px dashed #FFB74D; border-radius:20px;\"> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>\ucc38\uc870:<\/strong> <a href=\"https:\/\/physigeek.com\/ko\">\ud3c9\uade0 \uc18d\ub3c4 \uacf5\uc2dd<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\uc774 \uae30\uc0ac\uc5d0\uc11c\ub294 \ubb3c\ub9ac\ud559\uc758 \ud3c9\uade0 \uc18d\ub3c4\uac00 \ubb34\uc5c7\uc778\uc9c0 \uc124\uba85\ud569\ub2c8\ub2e4. \ub530\ub77c\uc11c \ud3c9\uade0 \uc18d\ub3c4\ub97c \uacc4\uc0b0\ud558\ub294 \ubc29\ubc95\uacfc \ub354\ubd88\uc5b4 \ud734\ub300\ud3f0\uc758 \ud3c9\uade0 \uc18d\ub3c4\ub97c \uacc4\uc0b0\ud558\ub294 \ud574\uacb0 \ubc29\ubc95\ub3c4 \uc54c\uc544\ubd05\ub2c8\ub2e4. \ud3c9\uade0 \uc18d\ub3c4\ub294 \uc5bc\ub9c8\uc785\ub2c8\uae4c? \ud3c9\uade0 \uc18d\ub3c4 \ub294 \uc6c0\uc9c1\uc774\ub294 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