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Back to work:   Three prostitutes stand outside on the street near their brothel, as the lights of motor scooters streak past them.  Two of them,  Sok Mom, 30, left, and  Lin Na, 36, center, visited the women's center earlier in the day.  They returned to their brothel in the Tuol Kok district to earn more money in the next few days during the Water Festival, when men from all over the country come to Phnom Penh to compete in the boat race during the day.   At night, many of them visit brothels, which experts say is a major factor in the spread of AIDS in Cambodia.