{"id":3916,"date":"2025-09-08T11:47:47","date_gmt":"2025-09-08T10:47:47","guid":{"rendered":"https:\/\/workboot.fr\/ciela\/?page_id=3916"},"modified":"2025-09-24T13:41:03","modified_gmt":"2025-09-24T12:41:03","slug":"l1-image-pbm","status":"publish","type":"page","link":"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/","title":{"rendered":"Format image PBM"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\ud83d\udd52 3h maximum<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le r\u00e9pertoire de travail sera <strong> ~\/Works\/L1PBM<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Utilisation de 2 Outils int\u00e9ressant , imagemagick et gimp<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">nous allons ici travailler avec le format&nbsp;<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Portable_pixmap\" target=\"_blank\" rel=\"noreferrer noopener\">pbm<\/a>&nbsp;en ASCII .&nbsp; (p\u00e9dagogique)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le wikipedia est tr\u00e8s bien fait.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le format ASCII&nbsp;<strong>pbm<\/strong>&nbsp;: voir le site de r\u00e9f\u00e9rence&nbsp;&nbsp;<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Portable_pixmap\" target=\"_blank\" rel=\"noreferrer noopener\">portable pixmap<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il existe \u00e9norm\u00e9ment de fichier image&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour les nos premiers tp image on va utiliser le format (P1) pbm en ascii pour bien assimiler les principes.<\/p>\n\n\n\n<nav aria-label=\"Table des mati\u00e8res\" class=\"wp-block-table-of-contents\"><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#prerequis\">Pr\u00e9requis<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#but\">But<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#h.v0oey8r4oywf_l\">A partir de Wikipedia expliquer les champs de ce fichier.<\/a><\/li><\/ol><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#h.yirl3nd4bwwy_l\">Imagemagick<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#h.qg9xzdvq8h37_l\">display<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#h.599jrhea664i_l\">Regardons notre image !\u00a0 avec display<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#h.nrbesjriozt9_l\">copier en J.pbm en J1.pbm<\/a><\/li><\/ol><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#convert\">convert<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#h.9i8dck15g7pl_l\">Format bmp en pbm\u00a0<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#h.t3jmsa3el15y_l\">Format compress\u00e9 ! pbm<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#h.q95jihflo8m0_l\">Format jpeg<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#h.396t9uwxe56d_l\">Format\u00a0png<\/a><\/li><\/ol><\/li><\/ol><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#gimp\">GIMP<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#regarder-votre-resultat\">Regarder votre r\u00e9sultat\u00a0<\/a><\/li><\/ol><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/#conclusion-sur-le-tp\">conclusion sur le TP<\/a><\/li><\/ol><\/nav>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"prerequis\"><strong>Pr\u00e9requis<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Machine Linux Lyc\u00e9e avec&nbsp;<a href=\"https:\/\/doc.ubuntu-fr.org\/imagemagick\" target=\"_blank\" rel=\"noreferrer noopener\">imagemagick<\/a>&nbsp;install\u00e9 , ici les commandes&nbsp;<strong>display<\/strong>&nbsp;et&nbsp;<strong>convert<\/strong>&nbsp;vont nous int\u00e9resser.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour installer&nbsp;imagemagick&nbsp;ces deux commandes sont \u00e0 saisir<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt update\nsudo apt install imagemagick -y<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">v\u00e9rifier que les commandes display et convert r\u00e9pondent bien sur votre terminal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D\u00e9couverte de&nbsp;GIMP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt update\nsudo apt install gimp -y<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"but\"><strong>But<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cr\u00e9ations d&rsquo;images au format ASCII pbm non compress\u00e9 et compress\u00e9 (notion)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h.v0oey8r4oywf_l\">A partir de Wikipedia expliquer les champs de ce fichier.<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">P1 c&rsquo;est quoi ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">dimension de l&rsquo;image ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">y&nbsp; a t&rsquo;il un moyen de mettre des commentaires ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">une ligne ne doit pas d\u00e9passer combien de caract\u00e8res ?&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h.yirl3nd4bwwy_l\">Imagemagick<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Est une suite d&rsquo;outils en ligne de commande qui vont nous aider \u00e0 utiliser des images.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h.qg9xzdvq8h37_l\">display<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C&rsquo;est une fonction offerte par imagemagick qui est le couteau suisse de l&rsquo;image&nbsp; num\u00e8rique ! Permet de visualiser les images de votre PC, <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>display J.pbm  <\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">On pourra utiliser aussi gimp, qui est le logiciel&nbsp;<strong>libre et opensource<\/strong>&nbsp;pour le traitement d&rsquo;image (en GTK+)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019\u00e9quivalent de photoshop ..&nbsp; en moins on\u00e9reux mais l\u00e9gal !<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">dans&nbsp; un r\u00e9pertoire&nbsp;<strong>imagepbm<\/strong>&nbsp; cr\u00e9er le fichier texte (ascii)&nbsp;suivant:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">fichier:&nbsp;J.pbm<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>P1\n# Un exemple bitmap de la lettre \"J\"\n7 10\n0 0 0 0 0 0 0\n0 0 0 0 0 1 0\n0 0 0 0 0 1 0\n0 0 0 0 0 1 0\n0 0 0 0 0 1 0\n0 0 0 0 0 1 0\n0 0 0 0 0 1 0\n0 1 0 0 0 1 0\n0 0 1 1 1 0 0\n0 0 0 0 0 0 0<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">avec vi cr\u00e9er ce fichier texte&nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h.599jrhea664i_l\">Regardons notre image !&nbsp; avec display<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">puis dans le terminal on va utiliser imagemagik la fonction display&nbsp; et l&rsquo;option -resize 100 pour afficher cette image en zoomant (-resize 100):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>display -resize 100&nbsp; J.pbm<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Expliquer ce que vous avez compris de&nbsp; ce fichier?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">P1 ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">#&nbsp; ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">7 10 ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">on appel ce type d&rsquo;image un fichier bitmap&nbsp; (carte de bit)&nbsp; pourquoi ?<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h.nrbesjriozt9_l\">copier en J.pbm en J1.pbm<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">on va modifier le fichier avec vi (c&rsquo;est un peu laborieux mais a faire ) (on pourra ne faire que les 2 premieres lignes)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">remplacer les espace par un retour a la ligne<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">par exemple:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>0 0 0 0 0 1 0 <\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">donne :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>0\n0\n0\n0\n0\n1\n0<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">v\u00e9rifier le fichier en lisant&nbsp; avec&nbsp;display<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">l&rsquo;espace est un d\u00e9limiteur qui \u00e0 le m\u00eame effet que le retour \u00e0 la ligne ici (on peut ajouter l&rsquo;option -resize pour mieux voir)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">display J1.pbm<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"convert\">convert<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">cette fonction est assez simple \u00e0 utiliser&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C&rsquo;est<strong> l&rsquo;extension du fichier qui permet de d\u00e9terminer le format.<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>convert J.pbm J.bmp&nbsp; #extension .pbm en .bmp\ndisplay J.bmp<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">(bmp contraction de bitmap)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">vous avez cr\u00e9\u00e9 un nouveau fichier image , on peut savoir rapidement ce que contient ce fichier gr\u00e2ce \u00e0 la fonction file<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">bruno@elliott:~\/Works\/langage_C\/pbm$ file J.pbm&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">J.pbm: Netpbm image data, size = 7 x 10, bitmap&nbsp; Un exemple bitmap de la lettre \u00ab\u00a0J\u00a0\u00bb, ASCII text<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">bruno@elliott:~\/Works\/langage_C\/pbm$ file J.bmp<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">J.bmp: PC bitmap, Windows 95\/NT4 and newer format, 7 x 10 x 24, cbSize 362, bits offset 122<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">bmp est donc un format propri\u00e9taire de Microsoft.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">lequel est le plus gros fichier ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cr\u00e9er une J.jpg &nbsp; et v\u00e9rifier ce que ca donne et pourquoi.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h.9i8dck15g7pl_l\">Format bmp en pbm&nbsp;<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">convert -compress none J.bmp Jcn.pbm<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">en ajoutant l&rsquo;option -compress none , il n&rsquo;y a pas de compression<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Justifier la taille de ce fichier &#8230;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">pourquoi est il plus petit que J.pbm&nbsp; ?<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h.t3jmsa3el15y_l\">Format compress\u00e9 ! pbm<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">convert&nbsp; J.bmp Jc.pbm<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Justifier Jc.pbm&nbsp; ! compress\u00e9 comment&nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h.q95jihflo8m0_l\">Format jpeg<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Faire les m\u00eame manipulations avec le format d&rsquo;image jpg<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h.396t9uwxe56d_l\">Format&nbsp;png<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Faire les m\u00eame manipulations avec le format d&rsquo;image&nbsp;png<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"gimp\">GIMP<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Utiliser GIMP pour editer vos images&nbsp;, outils graphique , un peu similaire \u00e0 Photoshop mais en open source .<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt update\nsudo apt install gimp -y<\/code><\/pre>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-8f761849 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">Cr\u00e9er avec GIMP un fichier pbm ASCII&nbsp; de G.pbm<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(voila mon G)&nbsp; faites mieux !<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-full is-resized\"><a href=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/G.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"7\" height=\"10\" src=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/G.jpg\" alt=\"\" class=\"wp-image-3941\" style=\"width:111px;height:auto\"\/><\/a><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">il faut des talents d&rsquo;artistes !&nbsp;(apr\u00e8s \u00e7a n&rsquo;est pas notre travail !)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">on affiche le J.pbm (pour garder la taille)&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP0-1.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP0-1-1024x576.png\" alt=\"\" class=\"wp-image-3931\" srcset=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP0-1-1024x576.png 1024w, https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP0-1-300x169.png 300w, https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP0-1-768x432.png 768w, https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP0-1.png 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">moi j&rsquo;ai utiliser la gomme et le stylo et voila mon G, apr\u00e8s c&rsquo;est amusant de cr\u00e9er.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP1.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP1-1024x576.png\" alt=\"\" class=\"wp-image-3932\" srcset=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP1-1024x576.png 1024w, https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP1-300x169.png 300w, https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP1-768x432.png 768w, https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP1.png 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>exporter<\/strong>&nbsp;du menu fichier au format pbm ascii!&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP2.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP2-1024x576.png\" alt=\"\" class=\"wp-image-3934\" srcset=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP2-1024x576.png 1024w, https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP2-300x169.png 300w, https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP2-768x432.png 768w, https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/09\/GIMP2.png 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Vous pouvez a cot\u00e9 du fichier pbm en ascii  (Gascii.pbm) renommer en Graw.pbm en Raw <\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"regarder-votre-resultat\">Regarder votre r\u00e9sultat&nbsp;<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Avec un editeur ascii comme hexdump , vous pouvez comparer ces 2 fichiers ..<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Avec display les regarder, et comparer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">display , file , vi , hexdump<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion-sur-le-tp\">conclusion sur le TP<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ecrire une conclusion sur le format d&rsquo;image pbm en ASCII&nbsp;et RAW<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udd52 3h maximum Le r\u00e9pertoire de travail sera ~\/Works\/L1PBM Utilisation de 2 Outils int\u00e9ressant , imagemagick et gimp nous allons ici travailler avec le format&nbsp;pbm&nbsp;en ASCII .&nbsp; (p\u00e9dagogique) Le wikipedia [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_crdt_document":"","_uag_custom_page_level_css":"","footnotes":""},"class_list":["post-3916","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Format image PBM - workboot<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/workboot.fr\/ciela\/l1-image-pbm\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Format image PBM - workboot\" \/>\n<meta property=\"og:description\" content=\"\ud83d\udd52 3h maximum Le r\u00e9pertoire de travail sera ~\/Works\/L1PBM Utilisation de 2 Outils int\u00e9ressant , imagemagick et gimp nous allons ici travailler avec le format&nbsp;pbm&nbsp;en ASCII .&nbsp; 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