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<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="buttonbox.js" xml:lang="cs">
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<info>
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<title type="text">ButtonBox (JavaScript)</title>
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<link type="guide" xref="beginner.js#layout"/>
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<link type="seealso" xref="button.js"/>
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<revision version="0.2" date="2013-06-25" status="review"/>
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<credit type="author copyright">
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<name>Meg Ford</name>
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<email its:translate="no">megford@gnome.org</email>
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<years>2013</years>
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</credit>
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<desc>Kontejner pro uspořádání tlačítek</desc>
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</info>
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<title>ButtonBox</title>
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<media type="image" mime="image/png" src="media/buttonbox_calculator.png"/>
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Kalkulačka – tlačítka jsou umístěna do vodorovných widgetů ButtonBox.
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<links type="section"/>
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<section id="code">
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<title>Kód použitý k vygenerování tohoto příkladu</title>
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#!/usr/bin/gjs
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imports.gi.versions.Gtk = '3.0';
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const GObject = imports.gi.GObject;
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const Gtk = imports.gi.Gtk;
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class ButtonBoxExample {
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// Vytvoří vlastní aplikaci
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constructor() {
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this.application = new Gtk.Application({
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application_id: 'org.example.jsbuttonbox'
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});
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// Napojí signály "activate" a "startup" k funkcím zpětného volání
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this.application.connect('activate', this._onActivate.bind(this));
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this.application.connect('startup', this._onStartup.bind(this));
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}
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// Funkce zpětného volání pro signál "activate" zobrazujicí okno při aktivaci
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_onActivate() {
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this.window.present();
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}
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// Funkce zpětného volání pro signál "startup" sestavující uživatelské rozhraní
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_onStartup() {
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this._buildUI();
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}
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// Sestaví uživatelské rozhraní aplikace
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_buildUI() {
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// Vytvoří okno aplikace
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this.window = new Gtk.ApplicationWindow ({ application: this.application,
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window_position: Gtk.WindowPosition.CENTER,
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title: "Calculator",
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default_width: 350,
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default_height: 200,
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border_width: 10 });
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this.entry = new Gtk.Entry();
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this.entry.set_text('0');
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// Text zarovnaný doprava
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this.entry.set_alignment(1);
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// Text ve vstupním poli nelze měnit psaním
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this.entry.set_can_focus(false);
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// Mřížka
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this.grid = new Gtk.Grid();
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this.grid.set_row_spacing(5);
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// Připojí vstupní pole
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this.grid.attach(this.entry, 0, 0, 1, 1);
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// Popisky pro tlačítka
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this.buttons = [ 7, 8, 9, '/', 4, 5, 6, '*', 1, 2, 3, '-', 'C', 0, '=', '+' ];
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// Každý řádek je ButtonBox připojený do mřížky
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for (let i = 0; i < 4; i++) {
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this.hbox = Gtk.ButtonBox.new(Gtk.Orientation.HORIZONTAL);
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this.hbox.set_spacing(5);
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this.grid.attach(this.hbox, 0, i + 1, 1, 1);
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// Každý ButtonBox má 4 tlačítka napojená na funkci zpětného volání
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for (let j= 0; j < 4; j++) {
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this.button = new Gtk.Button();
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this.buttonLabel = (this.buttons[i * 4 + j].toString());
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this.button.set_label(this.buttonLabel);
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this.button.set_can_focus(false);
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this.button.connect("clicked", this._buttonClicked.bind(this));
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this.hbox.add(this.button);
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}
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}
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// Pár proměnných pro výpočty
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this.firstNumber = 0;
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this.secondNumber = 0;
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this.counter = 0;
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this.operation = "";
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// Přídá mřížku do okna
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this.window.add(this.grid);
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this.window.show_all();
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}
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// Funkce zpětného volání pro všechna tlačítka
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_buttonClicked(button) {
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this.button = button;
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// Pro početní operace
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if (this.button.get_label() == '+') {
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this.counter += 1
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if (this.counter > 1)
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this._doOperation();
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this.entry.set_text('0');
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this.operation = "plus";
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}
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else if (this.button.get_label() == '-') {
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this.counter += 1;
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if (this.counter > 1)
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this._doOperation();
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this.entry.set_text('0');
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this.operation = "minus";
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}
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else if (this.button.get_label() == '*') {
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this.counter += 1;
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if (this.counter > 1)
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this._doOperation();
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this.entry.set_text('0');
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this.operation = "multiplication";
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}
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else if (this.button.get_label() == '/') {
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this.counter += 1
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if (this.counter > 1)
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this._doOperation();
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this.entry.set_text('0');
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this.operation = "division";
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}
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// Pro =
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else if (this.button.get_label() == '=') {
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this._doOperation();
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this.entry.set_text(this.firstNumber.toString());
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this.counter = 1;
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}
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// Pro mazání
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else if (this.button.get_label() == 'C') {
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this.firstNumber = 0;
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this.secondNumber = 0;
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this.counter = 0;
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this.entry.set_text('0');
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this.operation = "";
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}
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// Pro číslice
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else {
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this.newDigit = parseInt(this.button.get_label());
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if (this.entry.get_text() == "error")
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this.number = 0;
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else
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this.number = parseInt(this.entry.get_text());
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this.number = this.number * 10 + this.newDigit;
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if (this.counter == 0)
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this.firstNumber = this.number;
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else
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this.secondNumber = this.number;
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this.entry.set_text(this.number.toString());
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}
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}
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_doOperation() {
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if (this.operation == "plus") {
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this.firstNumber += this.secondNumber;
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} else if (this.operation == "minus") {
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this.firstNumber -= this.secondNumber;
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} else if (this.operation == "multiplication") {
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this.firstNumber *= this.secondNumber;
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} else if (this.operation == "division") {
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if (this.secondNumber != 0) {
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this.firstNumber /= this.secondNumber;
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} else {
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this.firstNumber = 0;
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this.secondNumber = 0;
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this.counter = 0;
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this.entry.set_text("error");
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this.operation = "";
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return
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}
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} else {
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this.firstNumber = 0;
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this.secondNumber = 0;
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this.counter = 0;
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this.entry.set_text("error");
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}
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}
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};
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// Spustí aplikaci
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let app = new ButtonBoxExample();
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app.application.run (ARGV);
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</section>
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<section id="references">
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<title>Odkazy k API</title>
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V této ukázce se používá následující:
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<list>
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<item><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.ButtonBox.html">GtkButtonBox</link> </item>
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<item><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Box.html">GtkBox</link> </item>
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<item><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Button.html">GtkButton</link> </item>
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<item><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Entry.html">GtkEntry</link> </item>
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<item><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Grid.html">GtkGrid</link> </item>
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</list>
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</section>
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</page>
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