ny two adjacent rectangle is the same, and the empty space of the row before the first and after the last rectangle are half the size of the other empty spaces.<br>
    3. the height of the 1, 2, 3 is the same as the height of the red rectangle.</p>
    <div id=test><div id=test01>1</div><div id=test02>2</div><div id=test03>3</div></div>
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