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NEW YORK—Wall Street capped a shortened trading week with a mixed finish Thursday after some uneven economic data: news of a contraction in the nation’s services sector and a tame reading on employment. But stocks still had their third dismal week in a row, with the major indexes again posting losses as worries about rising oil prices and the fallout from the credit crisis dogged the market.

Investors hoping for some guidance from two key economic reports got very little. The Institute for Supply Management said its index of service sector activity fell to 48.2 from 51.7 in May; th...