BY DON CURREN
TORONTO—The dollar pushed higher on renewed concerns about euro-zone debt, then trimmed its gains as investors shifted back into riskier assets.
The biggest winners in the seesaw battle between risk and safety were the commodity-linked currencies, with the Australian and New Zealand dollars ultimately strengthening against the greenback. The pound and the euro managed a partial rebound from early losses but ended weaker.
"Given the lack of economic data or news to trade off, the forex markets are squarely focused on fluctuations in stocks, commodities ...

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