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.left_two { background-color: red; opacity: 0.5; margin-left: -110px; }
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</style>
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-<div class="left_one">a</div>
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-<div class="left_two">b</div>
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+<div class="venn left_one">a</div>
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+<div class="venn left_two">b</div>
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### [1] Why we (I) love relational databases
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