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<svg>
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<defs>
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<g id="rainbow">
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<rect x="0%" y="0" width="<%= (100/5) %>%" height="100%" class="colour-2"/>
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<rect x="<%= (100/5)*1 %>%" y="0" width="<%= (100/5) %>%" height="100%" class="colour-5"/>
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<rect x="<%= (100/5)*2 %>%" y="0" width="<%= (100/5) %>%" height="100%" class="colour-4"/>
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<rect x="<%= (100/5)*3 %>%" y="0" width="<%= (100/5) %>%" height="100%" class="colour-3"/>
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<rect x="<%= (100/5)*4 %>%" y="0" width="<%= (100/5) %>%" height="100%" class="colour-1"/>
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</g>
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<image x="0" y="0" width="100%" height="100%" xlink:href="<%= @conference.cover_url || image_path('default_poster.jpg') %>" id="banner-image" preserveAspectRatio="xMidYMid slice"/>
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<filter id="f1" x="0" y="0" width="1" height="1">
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<feImage xlink:href="#rainbow" result="rainbow"/>
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<feImage xlink:href="#banner-image" result="banner-image"/>
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<feBlend mode="multiply" in="rainbow" in2="banner-image" />
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</filter>
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</defs>
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<rect width="100%" height="100%" filter="url(#f1)"/>
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</svg>
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