The top holding is Vestas Wind Systems which is based in Denmark and is a seller, installer, and servicer of wind turbines.

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Children holding hands, walking with the wind.

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But with the vast majority of married couples filing jointly, some spouses are bound to run off, lie about their off-the-books income, wind up in trouble, or otherwise leave their spouse holding the bag.

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After days spent tracking down forms, arguing with inspectors and holding for hours on the phone, "you just wind up breaking down crying, " she said.

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