| <div id="categories">
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| {% for category in categories %}
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|     <div class="checkbox_container">
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|         <input type="checkbox" id="checkbox_{{ category|replace(' ', '_') }}" name="category_{{ category }}" {% if category in selected_categories %}checked="checked"{% endif %} /><label for="checkbox_{{ category|replace(' ', '_') }}">{{ category }}</label>
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|     </div>
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| {% endfor %}
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| </div>
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