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<h3>
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    Enter a name for the custom expression:
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</h3>
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<h4>
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    Requirements:
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</h4>
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<ol class="justifyLeft">
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    <li>
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        The name must be unique and not already in use by the default expression.
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    </li>
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    <li>
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        The name must contain only letters, numbers, dashes and underscores. Don't include any file extensions.
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    </li>
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</ol>