I. Can be divided into the following 3 categories: old age 50-80 years old, 35-50 years old, Youth 18-35 years old, . If you divide it according to the territorial territory , Can be divided into two categories: rural users and urban users. three, according to levels: upper, middle and lower: high -end mid -end and low -end can also be divided into: senior ordinary rookie five, time points: front, middle and rear: young and old youth can also be divided into: Old man and child adults
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