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<div style="margin:0;padding:0;background: red; height: 66.66%; width: 66.66%; float: left;">screen1</div>
<div style="margin:0;padding:0;background: yellow; height: 33.33%; width: 33.33%; float: left;">screen2</div>
<div style="margin:0;padding:0;background: yellow; height: 33.33%; width: 33.33%; float: left;">screen3</div>
<div style="margin:0;padding:0;background: yellow; height: 33.33%; width: 33.33%; float: left;">screen4</div>
<div style="margin:0;padding:0;background: yellow; height: 33.33%; width: 33.33%; float: left;">screen5</div>
<div style="margin:0;padding:0;background: yellow; height: 33.33%; width: 33.33%; float: left;">screen6</div>
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