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Wal-Mart, the nation's largest private employer, is pushing to create a cheaper, more flexible work force by capping wages, using more part-time workers and scheduling more workers on nights and weekends. Wal-Mart executives say they have embraced new policies for a large number of their 1.3 million workers to better serve their customers, especially at busy shopping times. But some Wal-Mart workers say the changes are further reducing their already modest incomes and putting a serious strain on their child-rearing and personal lives.