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<div class="container">
<div class="up music"><img id="img_0" src="#"></div>
<div class="up music"><img id="img_1" src="#"></div>
<div class="down music"><img id="img_2" src="#"></div>
<div class="up music"><img id="img_3" src="#"></div>
</div>
<audio src="sounds/mud.wav"></audio>