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<h2 class="hd hd-2 unit-title">Real Space and Miller Indices</h2>
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<h2 class="hd hd-2 unit-title">Reciprocal Space</h2>
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<h3 class="hd hd-2">Reciprocal Space</h3>
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<h2 class="hd hd-2 unit-title">Review: Real Space</h2>
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<h3 class="hd hd-2">Review: Real Space</h3>
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<h2 class="hd hd-2 unit-title">Reciprocal Space, Part 2</h2>
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