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<p>useful and leading in some cases to the physically valuable patterns of the flavor mixing, the family symmetries are not yet observationally confirmed.</p>

<p><big> Introduction </big></p>
<p>The Standard Model is based on the <a href="page.php?w=Field_%28physics%29">internal symmetries</a> of the <a href="page.php?w=Unitary_group">unitary</a> <a href="page.php?w=Direct_product_of_groups">product group</a>  the members of which have a quite different nature. The <a href="page.php?w=color_charge">color symmetry</a>  has the vectorlike structure due to</p><p>
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