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Read the text and answer the question.Emma and Lily have been best friends since primary school. They met when they were seven and have shared many happy moments together. They have traveled to different countries, helped each other with school, and always supported one another. Last week, Emma helped Lily prepare for an important exam. Lily was very nervous, but thanks to Emma, she passed with a good grade. They are planning to celebrate this weekend.How long have Emma and Lily been friends?