Do you always understand the directions on bottle of medicine? Do you know what is meant by 'Take only as directed'? Read the following directions and see if you understand them. 'To reduce pain, take two tablets with water, followed by one tablet every eight hours, as required For nighttime and early morning relief(缓解疼痛) take two tablets at bedtime. Do not take more than six tablets in twenty-four hours. For children six to twelve years old, give half the amount. For children under six years old, ask your doctor's advice. Reduce the amount if you suffer from restlessness or sleeplessness after taking the medicine.' How many tablets at most can a person over 12 have in 24 hours?