RIO DE JANEIRO (AP) — When it rains, the dirt floor of the home where Taina Ferreira lives with her three small children turns to mud, and the contents of the open sewer that cuts in front of her front door sweep into the house. Ferreira, a 25-year-old single mother who works odd jobs as a maid, is one of an estimated 220,000 Rio de Janeiro residents trapped by the city's chronic housing deficit. Several hundred families carried their possessions — including washing machines, refrigerators and mattresses — the approximately 200 meters (yards) that separate the slum from the multistory housing project.