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  <section>
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  <section>
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    <title>B+trees</title>
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    <title>B+trees</title>
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    <indexterm>
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    <indexterm>
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      <primary>B-tree</primary>
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      <primary>B-trees</primary>
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      <secondary> - B+tree</secondary>
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    </indexterm>
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    </indexterm>
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    <para>HelenOS makes use of a variant of B-tree called B+tree. B+trees, in
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    <para>HelenOS makes use of a variant of B-tree called B+tree. B+trees, in
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    HelenOS implementation, are 3-4-5 balanced trees. They are characteristic
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    HelenOS implementation, are 3-4-5 balanced trees. They are characteristic
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    by the fact that values are kept only in the leaf-level nodes and that
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    by the fact that values are kept only in the leaf-level nodes and that