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120 watches go traveling. 85 of them go to Beijing, 90 go to Shanghai, and 80 go to Shenzhen. 60 of them only go to both Beijing and Shenzhen and 48 only go to both Shanghai and Shenzhen. 23 of them go to all the 3 places and 6 go to none of the places. watches only go to both Beijing and Shanghai.

Correct!