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While skills alone cannot develop good readers , few readers can become proficient without these fundamental skills . Greenhaw provides no empirical evidence to substantiate his statement - - such extreme views are now heard less frequently and opinion is strengthening that dust controls alone cannot eliminate pneumoconiosis . The total mortalities due to burns alone cannot be estimated with any degree of accuracy . For example , firewalls alone cannot detect and stop the new classes of threats now being directed at applications and databases .