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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css"> <div class="row"> <div class="col-md-12 order-md-2 order-lg-1">A</div> <div class="col-md-12 order-md-1 order-lg-2">B</div> </div>

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