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t �| �S )z�Convert text into an opcode.
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r )�flagsr c C s t | d@ d? �S )zpExtract an opcode from DNS message flags.
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t �| �S )z�Convert an opcode to text.
*value*, an ``int`` the opcode value,
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r$ c C s t | �tjkS )zmIs the opcode in flags UPDATE?
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