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<h2 class="hd hd-2 unit-title">Introduction: The Crystalline State</h2>
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<h3 class="hd hd-2">Introduction: The Crystalline State</h3>
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<h2 class="hd hd-2 unit-title">Translational Symmetry</h2>
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<h2 class="hd hd-2 unit-title">The Crystalline State in 2D</h2>
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