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<p>matter.</p>

<p>The smallest group of particles in a material that constitutes this repeating pattern is the <a href="page.php?w=unit_cell">unit cell</a> of the structure. The unit cell completely reflects the symmetry and structure of the entire crystal, which is built up by repetitive <a href="page.php?w=Translation_%28geometry%29">translation</a> of the unit cell along its principal axes. The translation vectors define the nodes of the <a href="page.php?w=Bravais_lattice">Bravais lattice</a>.</p>

<p>The lengths of principal axes/edges, of</p><p>
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