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<!DOCTYPE html>
<style>
div {
padding: 5px;
}
.b {
background: blue;
}
.r {
background: red;
}
</style>
<div class="r"></div>
<div class="r"></div>
<div class="b"></div>
<div class="b"></div>
<div class="b"></div>
<div class="b"></div>
<div class="r"></div>
<div class="r"></div>
<div class="b"></div>
<div></div>
<div class="b"></div>
<div></div>
<div class="r"></div>