If a patient is known to be allergic to any particular medication, then prescription of that medication shall result in a warning message being issued to the system user.

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If a patient is known to be allergic to any particular medication, then prescription of that medication shall result in a warning message being issued to the system user.

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If a patient is known to be allergic to any particular medication, then prescription of that medication shall result in a warning message being issued to the system user.

Your answer

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