While France has devised a plan to roll over Greece’s debts, and the Greek parliament -- in the face of a national strike and major protests -- just passed austerity measures requested by the European Union, these early signs that worst of the Greek debt crisis is over doesn't mean investors can relax and assume all is well.

Standard & Poor's Analyst Ken Leon says investors holding certain exchange-traded funds (ETFs) that have significant hidden exposure to Greek debt still need to be alert.

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