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<div style="clear:both; width:100%; margin: 25px 0 0 0; display: flex; flex-wrap: wrap; box-sizing: border-box; " id="mp-content">
<div style="box-sizing: border-box; float:left; flex: 1 0 25%; width:25%; border: 0.2em solid #FAFAFA; padding: 1em; background-color:#F3F3F3; overflow:hidden; min-width: 19em;">1<youtube width="260" height="200">https://www.youtube.com/watch?v=2OlQqWRugMo</youtube></div>
<div style="box-sizing: border-box; float:left; flex: 1 0 25%; width:25%; border: 0.2em solid #FAFAFA; padding: 1em; background-color:#F3F3F3; overflow:hidden; min-width: 19em;">Hola2</div>
<div style="box-sizing: border-box; float:left; flex: 1 0 25%; width:25%; border: 0.2em solid #FAFAFA; padding: 1em; background-color:#F3F3F3; overflow:hidden; min-width: 19em;">Hola3</div>
<div style="box-sizing: border-box; float:left; flex: 1 0 25%; width:25%; border: 0.2em solid #FAFAFA; padding: 1em; background-color:#F3F3F3; overflow:hidden; min-width: 19em;">Hola4</div>
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